10 Best Boiler Repair, Installation, and Maintenance Contractors in Chicago

What Are the 10 Best Boiler Repair, Installation, and Maintenance Contractors in Chicago in 2026?

City & Suburban Heating & Cooling ranks first for Chicago boiler work because the owner, Rob, runs the diagnosis himself instead of sending a commission-paid salesperson, so repair gets attempted before replacement gets quoted. Its Google profile holds a 5.0 rating across 190 reviews, and Google’s own review-topic clustering shows fair pricing as the most-mentioned theme at 27 mentions, with no upselling appearing in 5.[1]

⚠️ My conflict of interest, stated up front

I am Rob, and City & Suburban is my company. I put us at number one, so you should read this list knowing that.

Here is how I have tried to earn the benefit of the doubt. Every other contractor below carries its real Google rating, its real review count, and its real address. I quote their customers, including the unhappy ones. If a competitor fits your building better than we do, I say so in that company’s card.

⭐ The criteria I used, weighted in order

This is a boiler list, not a general HVAC list. Chicago’s pre-1970 housing stock runs on steam and hot water, and most HVAC firms are furnace-first. So the weighting reflects that.

1. Steam versus hot-water expertise. Heaviest weight. Steam is a different trade from forced air.
2. Radiator and hydronic system work. Balancing radiators, circulator pumps, and zone valves.
3. Pre-war housing experience. Bungalows, two-flats, three-flats, greystones, and gut-rehabbed condos.
4. Parts sourcing for legacy systems. Can they keep a 60-year-old block running, or only sell you a new one?
5. Repair-versus-replace honesty. Documented cases of a repair where another firm quoted replacement.
6. Diagnostic fee transparency. Is the fee published, and is it credited to the repair?
7. Permit and licence handling. Chicago mechanical permits must be pulled by a licensed contractor.[2]

💰 Who this guide is for

• The homeowner whose heat died last night and who needs someone to actually pick up.
• The homeowner holding a four or five figure replacement quote they do not trust.
• The owner of a pre-war home or two-flat with an ageing steam or hot-water boiler.
• The condo owner with radiators, no ductwork, and no duct path.
• The small landlord keeping a two-flat, three-flat, or six-flat warm on a budget.
• The small commercial manager who buys on downtime risk rather than price.

✅ The shortlist at a glance

1. City & Suburban Heating & Cooling: best for a second opinion on a replacement quote.
2. Browns Heating & Cooling: best for published, itemised repair pricing before work starts.
3. Four Seasons Heating, Air Conditioning: best for load-calculation-led boiler sizing at scale.
4. Service Pro Titans: best for next-day steam and hot-water boiler diagnostics.
5. Polar Heating and Air Conditioning: best for long-run maintenance relationships in the south and southwest suburbs.
6. U.S. Boiler Company: best for finding an installer certified on a specific boiler line.
7. Besco Air: best for boiler plus mini-split combinations in north-side and north-suburban homes.
8. Heatmasters: best for integrated boiler, radiant floor, and indirect water heater projects.
9. Williams Stoker Heating: best for condo association and multi-unit steam boiler replacement.
10. KTS Heating and Cooling: best for radiant floor and snow-melt hydronic repair.

📋 Master comparison table

⏰ One thing before you read the cards

If your heat is off right now, stop reading and call. City & Suburban Heating & Cooling answers at (773) 238-3838, and if we are not the right fit for your building, I will tell you who is. For everything that can wait until tomorrow, the Schedule Service form is fine.

City & Suburban Heating & Cooling

🔧 Overview

Boiler-related services: steam boiler repair, hot-water boiler repair, boiler installation and replacement, boiler maintenance, radiator balancing, circulator and zone valve work.

Overall service scope: heating, cooling, indoor air quality, and commercial. Repair, installation, replacement, and maintenance across boilers, furnaces, heat pumps, hybrid heating, ductless mini-splits, duct repair and sealing, humidifiers, dehumidifiers, and air cleaners.

Coverage area: Chicago and the near north and northwest suburbs, including Skokie, Northbrook, Glenview, Winnetka, Wilmette, Niles, Park Ridge, and Des Plaines.

Equipment types: gas-powered, plus propane and oil systems. Steam and hot-water boilers.

Types of service: residential and light commercial.

Rating: Google 5.0 across 190 reviews. Yelp 4.9 across 251 reviews, captured 8 August 2026.[1]

Pricing: free estimates, with the service call fee disclosed up front and credited toward the repair.

When to choose: you are holding a replacement quote you do not trust and want the owner, not a salesperson, to look at the system.

When not to choose: you need plumbing, sewer, electrical, or generator work bundled into the job; you need guaranteed overnight or Sunday emergency dispatch; you are outside Chicago and the near north and northwest suburbs; or you need a wall-mounted or through-the-wall AC unit serviced. Those are real limits, not modesty.

Contact: (773) 238-3838 · Schedule Service
Address: 1225 N Cleaver St, Chicago, IL 60642

👷 Why the diagnosis is the whole argument

My father started this business in 1952. He went door to door in Chicago offering furnace cleaning, and I run it now as the second generation.

I still do the service diagnostics myself. Nobody at City & Suburban earns more money if the answer is replacement, and that single fact changes what gets recommended in a basement.

🏚️ What a century-old Chicago boiler actually needs

A cast-iron boiler swap in a two-flat is a structural job before it is a mechanical one. We check whether the staircase can carry 800 lb on a single step, because the house is a century old and that wood may be dry.

Then there is the near-boiler piping. On a system retrofitted three times by three contractors, the piping is usually the fault, not the block.

⭐ What customers say

“The whole C&S team have been wonderful both in servicing our original furnace and air conditioning systems and with a full HVAC replacement this spring. They are knowledgeable, clear in their assessments and communication, reliable, courteous, and mindful of our budget and needs.”

– Raymond Fox, ★★★★★, City & Suburban Heating & Cooling Google – Verified Review

“Super responsive, knowledgeable, and friendly with very fair prices and quality work. Have used them the last 2 years to recharge my AC refrigerant and never got up sold.”

– Brian Hughes, ★★★★★, City & Suburban Heating & Cooling Google – Verified Review

“Our A/C stopped working during the recent heat wave. Other companies didn’t return our messages, but City & Suburban answered right away and were professional and communicative throughout.”

– Matt Feery, ★★★★★, City & Suburban Heating & Cooling Google – Verified Review

One honest caveat on those reviews. Google serves its most relevant reviews first, which skews positive for any business, including mine.[3]

City & Suburban Heating & Cooling holds a single-category Google profile with a 5.0 average across 190 reviews, and the strongest signal inside it is not the average. It is that fair pricing and no upselling surface as recurring themes in a corpus built mostly of repair calls.[1]

Browns Heating & Cooling

 

🔧 Overview

Boiler-related services: boiler pump replacement, emergency boiler repair, heating system repair, and maintenance. Their public Google categories are AC and furnace led, so boiler work appears in reviews rather than in a dedicated service listing.[3]

Overall service scope: air conditioning contracting and repair, furnace repair, heating contracting, whole-house humidifier installation, duct rerouting and sheet metal work, and smart thermostat installation.

Coverage area: Chicago, from 1 E Erie St. Suburban coverage is not publicly disclosed.

Equipment types: gas-powered forced air and hydronic. Electric thermostat and control work.

Types of service: residential and light commercial, including shop and storefront heating.

Rating: Google 4.9 across 208 reviews.[3]

Pricing: one verified customer reports a $125 service call credited toward any repair, with itemised prices quoted and confirmed before work started.[3]

When to choose: you want the number on the invoice explained line by line before anyone picks up a tool.

When not to choose: your project is a full steam boiler replacement in a pre-war building, since their published categories and review record centre on forced air, humidifiers, and ductwork rather than steam.

Contact: (708) 536-8134 · Email not publicly disclosed
Address: 1 E Erie St, Chicago, IL 60611

💸 Where Browns is genuinely strong

Pricing behaviour is the clearest thing in their review record. A customer lists the coil cleaning at $239, the sealant at $285, and the refrigerant at $370, all confirmed before the work began.[3]

That is rarer than it sounds. Most complaints in this trade are not about the repair; they are about the number arriving after the work.

🚿 Where the boiler evidence is thinner

The boiler proof exists, but it is narrow. One commercial customer describes a failed pump found and replaced the same afternoon, tested twice before the technician left.[3]

That is competent hydronic repair. It is not the same as replacing a compromised cast-iron block in a greystone, and I would not send that job here.

⭐ What customers say

“The boiler in my shop stopped working right before a busy weekend. James arrived that afternoon, found a bad pump, and replaced it right away. He tested everything twice before leaving to make sure the heat was working properly.”

– Jeannette Carroll, ★★★★★, Browns Heating & Cooling Google – Verified Review

“The service call cost $125, but that amount goes towards any repair cost if needed. Ramond clearly explained the impact of each along with the cost to fix, then confirmed which services I wanted and what my total would be before starting the work.”

– Justin Bassett-Green, ★★★★★, Browns Heating & Cooling Google – Verified Review

“He discovered that the filter housing was actually installed backwards by whoever worked on it last year. It was such a simple thing, but it made a massive difference. I really liked that he did not try to sell me a whole new system.”

– Paul Ernst, ★★★★★, Browns Heating & Cooling Google – Verified Review

That last review is the pattern worth noticing. Someone else installed the part backwards, and the fix was an adjustment rather than a sale.

City & Suburban Heating & Cooling discloses the service call fee up front and credits it toward the repair, the same practice Browns customers describe, and I include it here because a published, credited diagnostic fee is the cheapest honesty signal a Chicago homeowner can check before booking anyone.

Four Seasons Heating, Air Conditioning

🔧 Overview

Boiler-related services: boiler repair, boiler installation and replacement, and boiler maintenance, all with dedicated Chicago service pages and same-day and emergency positioning.[1]

Overall service scope: heating, cooling, water heaters, plumbing, and electrical, delivered as a multi-trade consolidator.

Coverage area: Chicagoland, from 5701 W 73rd St.

Equipment types: gas-powered boilers and furnaces, plus air conditioning and water heating.

Types of service: residential and commercial.

Rating: Google 4.7 across 30,383 reviews. That count is a multi-location aggregate, not a single Chicago branch.[1]

Pricing: not publicly disclosed as a fixed diagnostic fee. Quotes are presented in-home by a comfort advisor.

When to choose: you want a load calculation done properly, in writing, by a large firm with depth of crews.

When not to choose: you want the person who diagnoses your system to have no financial interest in the size of the sale.

Contact: (773) 219-2190 · Email not publicly disclosed
Address: 5701 W 73rd St, Chicago, IL 60638

✅ The best boiler evidence on this list

I have to be fair here, because one Four Seasons review is the single best sizing story in the whole review set. A townhouse owner with only 90 feet of baseboard was quoted boilers in the 120,000 to 150,000 BTU range by other firms.

Four Seasons’ Keith Williams explained the heating load instead and recommended smaller. That is what a heating load calculation is for, and it is the opposite of rule-of-thumb sizing on any heating system installation.

⚠️ Where the scale shows

Volume brings variance. One customer describes a bad compressor on a new 10K install, a missed appointment window, and a financing mess that cost them a combined loan.[1]

Neither review cancels the other. A large firm has a wide distribution of outcomes, and you are buying one draw from it.

⭐ What customers say

“Some proposals recommended boilers in the 120,000 to 150,000 BTU range for my townhouse with only 90 feet of baseboard, and at significantly higher prices. In contrast, Keith Williams took the time to explain the heating load, why proper sizing matters, and the technical reasoning behind his recommendation.”

– Ivan Tejeda, ★★★★★, Four Seasons Heating, Air Conditioning Google – Verified Review

“House felt good until the next day near noon. My appointment was from 8 to 10, 1030 came by never came. Comes out to be that the compressor was bad.”

– Ivan Solano, ★, Four Seasons Heating, Air Conditioning Google – Verified Review

City & Suburban Heating & Cooling cannot match this firm on fleet size or trades covered, and I will not pretend otherwise. What I will say is that the sizing conversation Ivan Tejeda describes is the conversation every boiler quote should contain.

Service Pro Titans

🔧 Overview

Boiler-related services: steam boiler repair, hot-water boiler repair, circulator pump replacement, and next-day emergency diagnostics.[1]

Overall service scope: furnace repair, HVAC repair and maintenance, air conditioning replacement, and boiler and heating system repair.

Coverage area: Chicago, from 924 W 38th Pl.

Equipment types: gas-powered steam and hot-water boilers, forced-air furnaces, and air conditioning.

Types of service: residential, including two-unit buildings, plus rental property work.

Rating: Google 4.9 across 186 reviews.[1]

Pricing: not publicly disclosed. One landlord reports the repair beat a competing replacement recommendation on cost and time.[1]

When to choose: your steam or hot-water boiler is down and you want it looked at tomorrow, not next week.

When not to choose: you need a full replacement handled with permit, rebate, and inspection paperwork, none of which appears in their public record.

Contact: (312) 312-7312 · Email not publicly disclosed
Address: 924 W 38th Pl Ste 101, Chicago, IL 60609

🔥 Real steam competence, in a homeowner’s words

This is the only company besides mine with two separate boiler service reviews that name actual components. One customer with an older home and a steam boiler had it inspected and repaired the same day.

Another had a circulator pump coupler break, then developed noise issues. A circulator pump is what pushes hot water around your radiators, and its coupler is a common wear part.

✅ The teaching habit is the tell

The second customer says the technician walked them through how the parts work and what maintenance to do. That is the behaviour I look for when I am judging another shop.

A technician who explains the system is not protecting a future upsell. They are trying to stop the next call.

⭐ What customers say

“I live in an older home with a steam boiler that needed some immediate attention. Rob, the technician from Service Pro Titans arrived that day, inspected, repaired my issue, and now it’s back to normal. He was very knowledgeable about the steam boiler systems.”

– J. L., ★★★★★, Service Pro Titans Google – Verified Review

“When my circulator pump coupler broke and then started having other noise issues last winter, Rob came out the next day and was able to diagnose and solve the problem. Rob walked me through how the different parts of the system work, maintenance steps I should take, and other common issues.”

– Clay K., ★★★★★, Service Pro Titans Google – Verified Review

“I had another company come out and simply say replace AC unit without any detailed diagnosis. The team at Service Pro Titans were able to repair the unit for considerable cost and time savings.”

– Satish Kunnassery, ★★★★★, Service Pro Titans Google – Verified Review

City & Suburban Heating & Cooling built its review record on that same pattern of repairing what another firm had already written off, and seeing it independently in another Chicago shop’s reviews is the reason this company sits above several much larger ones here.

Polar Heating and Air Conditioning

🔧 Overview

Boiler-related services: boiler repair with a published emergency service page and a boiler replacement cost guide for Chicago homes.[2][1]

Overall service scope: boiler repair, furnace repair and installation, air conditioning installation and maintenance, and twice-yearly tune-up programmes.

Coverage area: Orland Park base at 13801 SW Hwy, serving Chicago and the south and southwest suburbs.

Equipment types: gas-powered boilers and furnaces, air conditioning, and condo rooftop condensers.

Types of service: residential and light commercial, including condo buildings.

Rating: Google 4.6 across 1,122 reviews.[1]

Pricing: their boiler repair page publishes a $59.95 service call and free second opinions on repairs.[2]

When to choose: you want the same company doing a spring and autumn tune-up for a decade.

When not to choose: you are on the north side or in the near north suburbs, since their base and review pattern sit south and southwest.

Contact: (708) 675-3879 · Email not publicly disclosed
Address: 13801 SW Hwy, Orland Park, IL 60462

💰 The pricing behaviour worth copying

A published diagnostic fee is a small thing that tells you a lot. Polar puts $59.95 on the page and offers a free second opinion on repairs.[2]

That second-opinion offer is unusual for a firm of this size. It is also the single most useful thing a Chicago homeowner with a replacement quote can take advantage of.

⏰ Long relationships, not one-off tickets

The review record is dominated by customers measuring the relationship in years, not visits. One reports roughly ten years of twice-yearly service, and another 25 years back to when they lived in Chicago.[1]

That is what a business built on HVAC maintenance plans looks like from the outside. Nobody stays ten years with a company that invents repairs.

⭐ What customers say

“They are very very courteous and respect my time by calling before coming out and in the time frame they give you. If the service visit is minor, they dont try to squeeze extra money out of you to fix anything. Very honest.”

– Kimberly King, ★★★★★, Polar Heating and Air Conditioning Google – Verified Review

“Twice a year, I have Polar Heating and Cooling start-up, clean, and maintain both my AC and heating unit. I’ve been using them for approximately 10 years now, if not more, and have been very satisfied with the service they provide. I trust them.”

– Gracie Grace, ★★★★★, Polar Heating and Air Conditioning Google – Verified Review

City & Suburban Heating & Cooling has reviewers citing nine and ten year continuous relationships too, and I read that metric as more informative than any star average, because it survives a bad day.

U.S. Boiler Company

🔧 Overview

Boiler-related services: manufacturer of residential boilers, with an Illinois network page listing boiler installation and repair services for Chicago.[1]

Overall service scope: equipment manufacturing, dealer and installer network, parts supply, and product documentation.

Coverage area: Illinois network listing covering Chicago. This is a national manufacturer, not a local service company.

Equipment types: gas-powered residential boilers, plus oil-fired models.

Types of service: residential primarily, through its installer network.

Rating: no Google review data available for this listing.

Pricing: not applicable. Pricing comes from the installer you choose.

When to choose: you already know which boiler line you want and need an installer certified on it.

When not to choose: your heat is off tonight, because a manufacturer network page does not dispatch a technician.

Contact: contact routed through the manufacturer’s Illinois network page
Address: not applicable, national manufacturer

❌ Why a manufacturer is on a contractor list

Honesty first. U.S. Boiler ranks here because its Illinois network page ranks in Chicago boiler searches, appearing across five organic positions in the August 2026 capture.[1]

It is not a contractor, and you should not treat it as one. I have kept it in the list because pretending it does not rank would be dishonest about what you will actually find on Google.

✅ Where the page genuinely helps

There is one real use for it. If you want a specific boiler line installed, the manufacturer network tells you who is set up for it.

The other use is documentation. Manufacturer manuals and spec sheets are the primary source for what your equipment can actually do, and they outrank any contractor’s claim about it.

City & Suburban Heating & Cooling is an American Standard dealer, so I am familiar with how these manufacturer networks work, and my honest read is that they are useful for equipment research and useless for an emergency heating repair.

Besco Air

🔧 Overview

Boiler-related services: boiler repair and installation with a dedicated Chicago boilers service page, plus boiler and mini-split combined systems.[3][1]

Overall service scope: boilers, heat pumps, high-efficiency furnaces, ductless mini-splits, air conditioning, and ductwork damper balancing.

Coverage area: Chicago north side and north suburbs, from 5850 N Northwest Hwy, including Glenview.

Equipment types: gas-powered boilers and furnaces, and electric-powered mini-splits and heat pumps.

Types of service: residential, condo, and light commercial.

Rating: Google 4.9 across 1,484 reviews.[1]

Pricing: one customer reports a $200 visit charge on a call where no work was completed.[1]

When to choose: your home runs a boiler for heat and mini-splits for cooling, and you want one firm for both.

When not to choose: you live in a condo with an unusual mechanical layout, since one reviewer was told the unit could not be worked on and a competitor fixed it the next morning.

Contact: (312) 809-2695 · Email not publicly disclosed
Address: 5850 N Northwest Hwy, Chicago, IL 60631

✅ Strong on mixed hydronic and ductless homes

This is the clearest boiler plus mini-split record on the list. One Glenview customer runs a boiler for heat with seven mini-split cassettes and two compressors, all serviced by the same firm.[1]

That combination is common in older north-side homes with no duct path. Getting one company to own both halves is genuinely useful.

⚠️ The condo layout risk is documented

The one-star review matters because it is specific. The technician said the condo layout meant they could not work on the unit, the customer paid $200, and a competitor fixed it the next day.[1]

One review is not a pattern. It is still worth a phone call to describe your layout before booking.

⭐ What customers say

“I have a boiler for heat and 7 mini splits with 2 compressor’s for a/c. They have been great, today I had my spring inspection and cleaning with Alex. She was very through with each casset.”

– steve jaffe, ★★★★★, Besco Air Google – Verified Review

“The tech told me they wouldn’t be able to work on our unit because of our condo’s layout. I had a competitor come by the next day who knew how to work on our unit and fixed our problem that morning. So basically, I paid besco $200 to come by and give me wrong information.”

– Zachary Hornung, ★, Besco Air Google – Verified Review

“We bought a boiler from Besco last year and the installation was beautiful. A full report that day was emailed with graphics on the status of the AC.”

– Michael Gornetzki, ★★★★★, Besco Air Google – Verified Review

City & Suburban Heating & Cooling also fits ductless mini-splits into condos and additions with no duct path, and Besco’s record here shows why that capability belongs next to boiler work rather than in a separate business.

Heatmasters

🔧 Overview

Boiler-related services: 24/7 emergency boiler repair, boiler installation, and boiler maintenance, with a dedicated Chicago boiler repair page.[4][1]

Overall service scope: boilers, radiant floor heating, indirect water heaters, high-efficiency furnaces, air conditioning, thermostats, and monthly service agreements.

Coverage area: Chicago, from 5540 W Lawrence Ave.

Equipment types: gas-powered boilers and furnaces, and hydronic radiant floor systems.

Types of service: residential and commercial.

Rating: Google 4.8 across 757 reviews.[1]

Pricing: one long-term customer reports a $20 monthly service agreement.[1]

When to choose: your project ties a boiler to radiant floors or an indirect water heater and needs one coordinated design.

When not to choose: you want the owner on your service call, since this is a larger operation with many named technicians.

Contact: (773) 777-5700 · Email not publicly disclosed
Address: 5540 W Lawrence Ave, Chicago, IL 60630

✅ The best integrated hydronic story here

One customer needed a furnace, air conditioning, water heaters, and hydronic heat for a radiant floor, and spoke in depth with three Chicago installers. Hydronic simply means heat carried by hot water rather than air.

Heatmasters integrated an IBC boiler feeding a 55-gallon indirect water heater and a radiant floor, alongside a high-efficiency furnace. That is genuinely complex coordination.[1]

⏰ Emergency behaviour, from a four-star review

The most useful review is the four-star one. On the coldest Saturday of the winter, the technician judged the furnace needed replacing but could not replace it until Monday.

So he got it running under watch until then. Keeping a customer warm through a weekend on a condemned unit is real work, and it is why that review is here.[1]

⭐ What customers say

“He was able to temporally get the furnace to work under watch through to Monday where they came and changed out the furnace for a new one. Huge shout out to Anthony for keeping the furnace working until the new one arrived.”

– Smitty Smith, ★★★★, Heatmasters Google – Verified Review

“Able came out and wired my nest to the new boiler Heatmasters installed. I have a 1950s ranch and they installed a brand new boiler in one day. They are local and mom and pop.”

– Matthew Bajt, ★★★★★, Heatmasters Google – Verified Review

“They successfully integrated an IBC boiler system (heating an 55 gal indirect water heater and a radiant floor) and a Carrier high-efficiency furnace and side discharge condenser into a unified smart home setup.”

– Madison Major, ★★★★★, Heatmasters Google – Verified Review

City & Suburban Heating & Cooling takes the same view Heatmasters’ technician acted on that Saturday, which is that keeping a system running safely until the right part arrives beats a rushed same-day replacement.

Williams Stoker Heating

🔧 Overview

Boiler-related services: steam boiler replacement, hot-water boiler replacement, boiler repair and maintenance, free estimates, and commercial water heaters.[1]

Overall service scope: central heating service and mechanical contracting, including boiler removal, installation, electrical setup, and hot water systems.

Coverage area: Chicago and the North Shore, from 1823 W Belmont Ave.

Equipment types: gas-powered steam and hot-water boilers, and commercial water heaters.

Types of service: residential, condo association, and multi-unit commercial.

Rating: Google 4.7 across 200 reviews.[1]

Pricing: free consultations and estimates. One customer reports quotes from North Shore competitors running 50% to 100% higher.[1]

When to choose: you manage a condo association or multi-unit building and need a steam boiler replaced properly.

When not to choose: you need cooling work, since the public record here is heating and hot water, not air conditioning.

Contact: (773) 549-7997 · Email not publicly disclosed
Address: 1823 W Belmont Ave, Chicago, IL 60657

✅ The steam replacement specialists

If I had to hand a steam boiler replacement to someone else in this city, this is where I would look first. One customer replacing an old steam boiler says they were the only firm of several to provide a clear, comprehensive quote.[1]

Another reports years of service on a Lincoln Square condo building. Older buildings with boiler heat are named repeatedly in their reviews, which is the pattern that matters.

✅ No fear-based selling in the record

One boiler replacement customer is explicit about it. They never felt pressured to buy out of fear or through time-based sales tactics.[1]

That sentence describes the absence of a sales script. It is rare enough in this trade that a customer thought to write it down.

⭐ What customers say

“They are reliable, priced fairly, and very knowledgeable when it comes to older buildings with a boiler heating system. Shoutout to Andrew who took the time to answer some questions so that the system runs more efficiently.”

– Kristin Ackmann, ★★★★★, Williams Stoker Heating Google – Verified Review

“Of the companies we contacted for estimates, they were the only one to provide a clear and comprehensive quote, and their overall professionalism was outstanding.”

– Sam L, ★★★★★, Williams Stoker Heating Google – Verified Review

“I never felt pressured to buy out of fear or through time-based sales tactics. Instead, they helped me to understand my needs and options to get it replaced quickly and get the greatest value.”

– Robert C., ★★★★★, Williams Stoker Heating Google – Verified Review

City & Suburban Heating & Cooling and this firm overlap heavily on pre-war Chicago boiler work, and I would rather tell you that plainly than pretend a 200-review steam specialist on Belmont is not good at this.

KTS Heating and Cooling

🔧 Overview

Boiler-related services: boiler repair and replacement with a dedicated boiler repair page, plus radiant floor and snow-melt hydronic repair.[5][1]

Overall service scope: boilers, radiant floor heating, snow-melt systems, furnaces, air conditioning, commercial rooftop units, and maintenance.

Coverage area: Chicago, from 4256 N Ravenswood Ave.

Equipment types: gas-powered boilers and furnaces, electric-powered controls, and hydronic radiant systems.

Types of service: residential, condo, and commercial, including a dog training facility with rooftop units.

Rating: Google 5.0 across 123 reviews.[1]

Pricing: not publicly disclosed as a fixed fee. Multiple customers describe fair pricing with no hidden costs.[1]

When to choose: your radiant floor or snow-melt loop has failed and you need someone who works on hydronics daily.

When not to choose: you want a long public track record, since 123 reviews is the smallest count on this list.

Contact: (708) 480-9798 · Email not publicly disclosed
Address: 4256 N Ravenswood Ave, Chicago, IL 60613

✅ Radiant and snow-melt is a genuine niche

Radiant floor heating and snow-melt loops are hydronic systems, which means they run on the same hot water logic as your boiler. Very few Chicago firms show repeated public evidence of both.

KTS does. One duplex-down condo owner had a broken radiant system replaced alongside new equipment, and reports floors running at 78 to 80F.[1]

💰 They actually filed the rebate

This is the detail I want you to notice. That same customer got a significant rebate through their gas utility and expects a tax credit, because high-efficiency equipment was specified.[1]

Rebate paperwork is unglamorous, and most contractors leave it to you. A firm that handles it is doing part of your job for you.

⭐ What customers say

“The radiant floor heating in my bedroom completely went out right when I needed it most. They diagnosed the issue quickly and handled the radiant heat flooring repair efficiently. Their services were very fairly priced, no hidden fees or surprise costs.”

– Elizabeth Herlihy, ★★★★★, KTS Heating and Cooling Google – Verified Review

“The KTS employees were very professional and helped us fix our snow melt system successfully. Never felt like they were trying to upsell or take advantage of us.”

– Chris Myers, ★★★★★, KTS Heating and Cooling Google – Verified Review

“By using high efficiency products we were able to get a significant rebate through People’s Gas and will get a large tax credit next year. The floors are 78-80F, which keeps the entire downstairs at a really comfortable temperature.”

– Jacob Miller, ★★★★★, KTS Heating and Cooling Google – Verified Review

City & Suburban Heating & Cooling handles ComEd and Nicor Gas rebate eligibility on replacements for the same reason, because an unfiled rebate is money the homeowner earned and never received.

📋 How I evaluated these ten

The ranking comes from a Chicago-localised Google capture taken on 8 August 2026, reading 43 organic results and 18 local-pack results, with 24 distinct companies found. Ratings, review counts, addresses, and phone numbers are copied from live Google Business Profiles.[1]

What I could verify: ratings, review counts, addresses, service categories, and published diagnostic fees. What I could not verify: response times, warranty terms, technician counts, and licence numbers, so none of those appear as claims.

City & Suburban is my own company, and I placed it first. Read the criteria and decide whether you agree.

⚠️ Two honesty notes on the review data

Google serves its most relevant reviews first, which skews every profile positive, including mine. A single one-star review on a 4.9 business proves a specific incident, not a pattern.[1]

Review counts above 5,000 are multi-location aggregates. Four Seasons’ 30,383 reviews are not one Chicago branch.[1]

💬 What Chicago homeowners say off the listicles

Directories only list advertisers, so the specialists Chicagoans actually recommend to each other often appear nowhere in them.

“We just had Berwyn Western do our ancient boiler about a week and a half ago. Their guy did great work, explained everything to me.”

– r/AskChicago, Reddit Thread

“Fewer Boiler or The Steam Whisperer.”

– r/AskChicago, Reddit Thread

Those are two comments, not a consensus. Treat them as leads to check, not verdicts.

✅ Which provider should you shortlist?

• No heat tonight: City & Suburban Heating & Cooling, or Heatmasters if you need cover past midnight.
• A replacement quote you want checked: City & Suburban for an owner-run second opinion, or Polar for its free second opinion on repairs.
• A hundred-year-old steam boiler: Williams Stoker Heating or Service Pro Titans.
• A condo with radiators and no ducts: Besco Air for boiler plus mini-split work.
• A six-flat or condo association you manage: Williams Stoker Heating.
• Radiant floors or a snow-melt loop: KTS Heating and Cooling.
• A storefront or rooftop unit: KTS Heating and Cooling, or Four Seasons for commercial HVAC scale.

If your heat is out now, call City & Suburban Heating & Cooling at (773) 238-3838. Anything that can wait goes through the Schedule Service form, and the $50 off service call offer applies to everything except duct cleaning.

References

1. DOE Energy Conservation Standards for Consumer Boilers, technical support document, 84% AFUE minimum for gas-fired hot-water boilers manufactured on or after 15 January 2021.
2. City of Chicago Guide to Building Permits, Mechanical (HVAC) Work.
3. Nicor Gas residential energy efficiency rebates, 95% AFUE minimum for eligible boilers.
4. City & Suburban Heating & Cooling review pack, Google and Yelp profiles captured 8 August 2026.
5. Chicago boiler category SERP and Google Business Profile capture, 8 August 2026.
6. r/AskChicago residential boiler contractor threads, November 2022 and November 2025.
7. Angi Chicago boiler installation cost data, $5,071 average.
8. Polar Heating and Air Conditioning published boiler repair service call fee.

How Do You Vet a Chicago Boiler Contractor Before You Sign Anything?

Ask how many steam systems the firm serviced last winter, then get five things in writing before signing: the Manual J load calculation, the AFUE and AHRI certificate for the exact model, the permit class and licence number it will be pulled under, the named rebate line item, and who performs the diagnosis versus the install. A quote missing these is a price, not a plan.

⚠️ The pressure you are under is the problem

A generalist has told you the whole system needs replacing. There is a deposit request in front of you, and it is cold outside.

That combination is where most bad Chicago boiler decisions get made. So slow down by exactly one phone call.

🔥 Three questions that test real steam competence

Steam and hot-water boilers are a different trade from forced-air furnaces. Most HVAC firms in this city are furnace-first, and they will still say yes to your job.

Ask these on the phone. A competent answer sounds specific, not reassuring.

1. How many steam systems did you service last winter? A real steam boiler service shop answers with a number, not “we do it all.”
2. What is my near-boiler piping situation? Near-boiler piping is the pipework right at the boiler, and on a century-old system it is usually where the fault lives.
3. Will you balance my radiators after the swap? Balancing means adjusting each radiator so the heat spreads evenly, and a firm that skips it does not understand the system.

City & Suburban Heating & Cooling diagnoses these systems in pre-war bungalows, two-flats, greystones, and gut-rehabbed condos across Logan Square and the surrounding neighbourhoods, and the retrofit history usually explains the fault better than the boiler’s age does.

📋 The five documents to demand

City & Suburban Heating & Cooling pulls the Chicago mechanical permit under its own licensure and schedules the inspection as part of the job, and I raise that here because an unpermitted replacement leaves no public record that anyone touched your gas appliance.

💸 The word-track tells of a commission-paid seller

Sizing by rule of thumb is the loudest one. If someone quotes capacity without measuring your building, the number came from a habit, not your house.

The second tell is a certified-sounding word doing no work. “Manufacturer recommended” and “our best option” are sales vocabulary, not specifications.

The third is “family owned” as the whole argument. It is often true and sometimes covers private-equity ownership, so it proves nothing on its own.

⭐ What a good vetting experience looks like

“Eddie and his coworker arrived promptly, were nice & polite, and explained their work well. I was able to see their work after. I requested they use a higher end 5-2-1 compressor saver (hard start kit) for my old outdoor AC condenser unit.”

– Edward Lee, ★★★★★, City & Suburban Heating & Cooling Google – Verified Review

“Of the companies we contacted for estimates, they were the only one to provide a clear and comprehensive quote, and their overall professionalism was outstanding.”

– Sam L, ★★★★★, Williams Stoker Heating Google – Verified Review

“Fewer Boiler or The Steam Whisperer.”

– r/AskChicago, Reddit Thread

That Reddit comment is one person’s view, not a consensus. It is useful because the specialists Chicagoans name to each other rarely appear in any directory list.

✅ Your payoff

Get three quotes. Reject any outlier that sits far above the documented Chicago range without a stated reason.

City & Suburban Heating & Cooling reviewers describe assessments rather than sales visits, and Google’s own topic clustering of the 190-review corpus surfaces problem diagnosis 14 times and honest assessment 4 times. You can book that assessment here.

What Does Boiler Repair, Installation, and Maintenance Actually Cost in Chicago?

Chicago boiler installation averages $5,071, with most projects between $2,472 and $8,294: unit $1,400 to $6,500, labour $1,200 to $3,200, permits $50 to $250, and chimney liner $1,500 to $4,000. Diagnostic visits in this market are published between $59.95 and $79, usually credited to the repair. Chimney liner and gas-line work are the two items that move a quote by thousands.

💰 Why no page gives you an honest number

Most cost pages quote a range so wide it is useless. The range is wide because the building, not the boiler, drives the price.

So here is the same money broken into line items, with the source named for each.

City & Suburban Heating & Cooling discloses the service call fee up front and credits it toward the repair, which is the single line most worth confirming before anyone drives out on a heating repair call.

❌ Two numbers I will not repeat to you

You will read that boilers last 15 to 30 years, and that replacement runs $4,500 to $9,000. Both figures circulate widely on Chicago contractor pages.

Neither traces to a primary dataset. No AHRI certified-ratings record or DOE standards document supports a lifespan average, so treat those numbers as marketing copy and not evidence.

✅ How to read the quote you are holding

Ignore the headline price first. Read the line items, because that is where the difference between two quotes actually lives.

A quote with no chimney liner line, no permit line, and no gas-line line is not cheaper. It is incomplete, and the difference arrives later as a change order.

⏰ Why the install day sets the bill for a decade

Most of a boiler’s working life is decided on the day it goes in. Poor near-boiler piping, wrong sizing, and skipped balancing all cost money every winter afterwards.

Cheap installs are the expensive ones. That is not a slogan; it is what turns up when someone calls me about a system installed five years ago.

⭐ What customers say about pricing

“The guys who came to do the installation were very friendly and worked cleanly and efficiently. Their pricing was significantly better than the other quotes we received.”

– Stephanie Salamanca, ★★★★★, Polar Heating and Air Conditioning Google – Verified Review

“I received several quotes from other providers in the North Shore area that were anywhere from 50% to 100% higher. This experience reinforced that higher pricing doesn’t translate to better service or expertise.”

– Jake Merkle, ★★★★★, Williams Stoker Heating Google – Verified Review

“I had My annual maintenance for my A/C unit. We have had Heatmasters for over 30 years and continue to get good service. We pay a monthly service agreement of $20.”

– Sallie Eggers, ★★★★★, Heatmasters Google – Verified Review

A 50% to 100% spread between quotes on the same job is normal in this market. That spread is why three quotes is the minimum, not the ideal, and why an annual maintenance plan is priced separately from repair work.

City & Suburban Heating & Cooling’s Yelp record, 4.9 across 251 reviews captured in August 2026, includes a near-total teardown billed at $164 and a repair completed for a customer another firm had quoted $1,800.

 When Is a Chicago Boiler Worth Repairing, and When Is It Genuinely Dead?

If the system is over roughly 12 years old and the repair exceeds about a third of replacement cost, the maths starts tipping toward replacement. Age alone is not a verdict. A compromised cast-iron block venting steam up the chimney is terminal; a failed circulator, zone valve, low-water cutoff, or gas valve almost never is.

💸 You are holding a five-figure quote

Someone has told you the boiler is finished. That may be true, and it may be the branch of the decision tree they are paid to reach.

The way to tell the difference is component by component. So start there.

✅ Repairable versus terminal, part by part

Steam leaving a compromised block goes up the chimney as white cloud on a cold day. That is one of the few sights in this trade that genuinely ends the conversation and moves you to heating system replacement.

⚠️ The one-third rule, and where it breaks

Over 12 years old, plus a repair above a third of replacement cost, is a fair place to start the maths. It is a starting point, not a rule.

It breaks in both directions. A well-maintained cast-iron boiler in a two-flat can outlive the rule, and a badly installed five-year-old unit can fail it.

City & Suburban Heating & Cooling attempts the repair before quoting replacement, because there is no commission attached to the answer when the owner does the diagnosis.

❌ Demand documentation for these four phrases

“Cracked block,” “red tag,” “unrepairable,” and “parts no longer available” are the four claims most often used to justify full replacement. Each one can be documented, and each one should be.

Ask for the photograph, the combustion analysis printout, or the manufacturer’s parts-discontinued notice. A genuine finding survives that request without friction.

⏰ Why I read these claims sceptically

I watched the same pattern form around refrigerant. Price pressure on refrigerant turned into a script where topping off was quoted so high that a new system looked reasonable by comparison.

The cracked-block claim works the same way on the heating side. City & Suburban Heating & Cooling has reviewers who came for a second opinion after another firm quoted full replacement, and one of those repaired units then ran for years.

⭐ Second opinions, in customers’ words

“The storm on June 10 knocked out my AC unit and Rob was out the same day. He immediately identified and fixed the issue. Not only does Rob know what he’s doing, he’s responsive, a total pro, and easy to work with.”

– Gabe Young, ★★★★★, City & Suburban Heating & Cooling Google – Verified Review

“He did my yearly AC tuneup, corrected some work done in the past by another company, and replaced my capacitor. Great work and good prices and completed in a timely manner.”

– Pam Garceau, ★★★★★, Besco Air Google – Verified Review

“First, he gave me advice over the phone to really make sure it needed a visit from a pro (it did). When he got here, he shared options and explained everything very clearly.”

– Daniel Charles, ★★★★★, KTS Heating and Cooling Google – Verified Review

📋 Your second-opinion script

Say this: “I have a replacement quote. I want a diagnosis, not a quote, and I will pay the service call for it.”

City & Suburban Heating & Cooling’s review record includes a case where a competitor hard-sold a $7,000 furnace and the customer was talked out of replacing it at all, which is the outcome that script is designed to produce. That judgement sits behind every heating service call we run.

Do You Need a Permit and a Licensed Contractor to Replace a Boiler in Chicago?

In Chicago, no building permit is required to repair or replace a boiler in-kind in a residential building up to four stories. Any other complete replacement requires a mechanical permit, and only a licensed contractor may pull it. Welded repairs to a boiler’s pressure-retaining boundaries require Illinois repairer licensure under Municipal Code 4-266-010.

⚠️ Someone told you no permit is needed

That sentence is sometimes completely true. It is also the easiest thing to say when a contractor does not hold the licence to pull one.

The difference comes down to what kind of work is being done. So here is the actual scope, in plain terms.

📋 The Chicago permit scope table

“In-kind” means the same type of equipment at the same capacity. Change the fuel, the capacity, or the venting arrangement, and you are usually outside that exemption.

City & Suburban Heating & Cooling pulls the mechanical permit under its own Chicago licensure and schedules the inspection as part of the job, so it is not left as the homeowner’s follow-up task on a boiler replacement.

✅ Who is allowed to pull it

Chicago requires a City of Chicago regulated business licence alongside state-level mechanical contractor credentials issued under Illinois rules. That combination is what lets a firm file the permit.

You can check both before you pay anything. The city runs a contractor licence lookup, and any legitimate firm will hand you its licence number without hesitation.

💸 Why the permit is worth insisting on

A permit creates the only public record that a stranger worked on your gas appliance. It also triggers an inspection by someone with no financial interest in the job.

Skipping it saves $50 to $250 on the quote. It costs you your only independent check on the work, and it can surface later when you sell the building.

📞 What to ask, before the deposit

Say this, in this order:

1. Which permit class applies to my job, and why? A firm that knows the answer explains the in-kind rule without prompting.
2. Whose licence number will appear on the permit? It should be the company doing the work, not a subcontractor you never met.
3. Who schedules the inspection, and when? If the answer is “you do,” treat that as part of the price.
4. If no permit applies, which exemption are you relying on? The answer should name in-kind replacement or repair, not vagueness.

City & Suburban Heating & Cooling handles Chicago mechanical permits and inspections as routine process work on every heating installation, and I put these four questions in your hands because they are the fastest way to sort a licensed firm from a confident one.

⏰ One honest caveat on this section

Permit rules change, and the express permit criteria are updated by the city rather than by contractors. I have cited the current city guidance rather than paraphrasing it from memory.

If your building is over four stories, or mixed use, the residential exemption logic above may not apply to you at all. That is a call to the Department of Buildings, not to a blog, and larger buildings usually fall under commercial HVAC rules instead.

City & Suburban Heating & Cooling is licensed in the City of Chicago and the State of Illinois, and the reason that matters here is simple: an unpermitted replacement has no inspection, and an uninspected boiler has nobody’s signature on it but the installer’s.

 Which Boiler Efficiency Ratings and Nicor Gas Rebates Actually Matter in 2026?

The federal minimum for gas-fired hot-water boilers is 84% AFUE, effective for units made on or after 15 January 2021, so 84% is the legal floor rather than high efficiency. Nicor Gas pays $350 for boilers at 95% AFUE or above under 300 MBTUH, and $500 for a combination boiler with sealed combustion, modulating firing rate, and programmed outdoor reset control.

❌ “High efficiency” is not a specification

AFUE stands for Annual Fuel Utilization Efficiency, and it is the percentage of fuel that becomes usable heat. Current federal standards set 84% for gas hot-water boilers and 82% for gas steam boilers.

So a quote that says “high efficiency” and shows 84% is describing the legal minimum. Ask for the number, in writing, on the quote.

⚠️ The floor is likely to move

The Department of Energy has proposed raising the hot-water boiler standard to 95% AFUE. That would effectively make condensing boilers the baseline.

A condensing boiler extracts extra heat from its own exhaust, which is how it clears 90%. If you are buying now, that proposal is worth knowing about, though I would not delay a failed boiler waiting for it.

💰 What Nicor Gas actually pays in 2026

Read the middle row twice. The rebate is not paid for efficiency alone; it is paid for specific hardware features.

✅ The qualification checklist

Outdoor reset control adjusts water temperature based on the weather outside, and a modulating boiler varies its flame instead of running flat out. Both are conditions, not upgrades you can add later on paper.

1. Confirm the AFUE number on the quote, not the phrase.
2. Get the AHRI certificate for the exact model, since AHRI certifies the rated performance.
3. Ask which rebate line the model qualifies for, by name.
4. Confirm who files the application and attaches the certificate.
5. For a tune-up rebate, confirm combustion efficiency is tested before and after.

City & Suburban Heating & Cooling handles ComEd and Nicor Gas rebate eligibility on replacements, and my flat view is that an unfiled rebate is money the homeowner earned and simply never received.

💸 Sizing beats efficiency on your actual gas bill

An oversized boiler short-cycles, which means it fires, satisfies quickly, and shuts off repeatedly. That wears parts and wastes fuel, no matter how good the AFUE number looks.

Never accept capacity sized by a square-foot rule of thumb. Insist on a Manual J load calculation, which is the ACCA method for measuring what your building actually loses in heat.

⏰ On heat pumps, where I am genuinely undecided

Plenty of people in this trade argue for full electrification now. I sit closer to hybrid heating, where the boiler or furnace takes over at low outdoor temperatures.

Chicago winters are the reason. I may be reading the equipment too conservatively, and I would rather say that than pretend the question is settled, which is also why heat pump options are quoted case by case here.

City & Suburban Heating & Cooling is an American Standard dealer with NATE-certified technicians, and on replacements the capacity comes from a load calculation rather than from the nameplate of the boiler being carried out.

 Why Do Chicago Boilers Fail Early, and What Makes One Last?

Service life is set on install day and defended monthly. A cast-iron replacement in a century-old two-flat is structural before it is mechanical: the staircase has to carry roughly 800 lb on a step, the chimney may need a liner, and near-boiler piping usually needs rebuilding. Then, during the heating season, drain a little water once a month to confirm the low-water cutoff still works.

🏚️ The quote that ignores the building

Most early failures I see were built into the job on day one. A boiler quoted from a phone call has not accounted for the house it is going into.

Before I order a cast-iron boiler for an older two-flat, I check the staircase. It has to carry roughly 800 lb on a single step, and in a house that is a century old, that wood may be dry.

⚠️ Four install-day decisions that set the lifespan

• Chimney liner. An old chimney may not safely vent a new boiler, and a liner runs $1,500 to $4,000.
• Near-boiler piping. On a system retrofitted three times, the piping is usually the real fault and needs rebuilding.
• Sizing. Oversized equipment short-cycles and wears out early, which is why load calculation matters more than brand.
• Radiator balancing. Without it, you get one hot room and three cold ones on a brand-new boiler.

City & Suburban Heating & Cooling diagnoses these failure modes in bungalows, greystones, worker cottages, and gut-rehabbed condos from Ukrainian Village outward, and the retrofit history explains more than the equipment’s age does.

⏰ The monthly routine that costs you nothing

During the heating season, drain a small amount of water from the boiler once a month. That is also the one time you add water back.

The point is not the water. The point is confirming the low-water cutoff still works, since that control shuts the boiler down if the water level drops too far.

❌ The automatic water feeder is not a safety upgrade

An automatic water feeder adds water for you. In my experience, these fail stuck in the feed position more often than they fail closed.

Stuck open, it keeps filling. Piping, radiators, and eventually the floor take the water, which is a far worse outcome than a boiler that simply stopped.

✅ Two small things people get wrong

Thermostat batteries should read at least 1.5 volts each. If two together read 1.9 volts, they are effectively drained, and the thermostat cannot reliably call for heat.

The other one is the switch. Many gas appliances are wired to a 120-volt 15-amp light switch, and the contacts burn. A 120-volt 20-amp rated switch is the correct part.

💰 Why a tune-up is measurable, not a ritual

Dirt is insulation, and a machine that works by moving heat cannot move it through a blanket. That is the whole argument for annual heating maintenance.

The utility treats it as measurable too. Nicor’s boiler tune-up rebate requires combustion efficiency to be tested before and after the work, and to have improved.

⭐ What customers say about upkeep

“Thomas was very helpful in checking to make sure I understood the routine maintenance and the ‘why’ of that maintenance. He also made sure, as an owner, I understood things I could do to keep my system well cared for.”

– Michele C., ★★★★★, Heatmasters Google – Verified Review

“Been a customer for +10 years!! The Technician was very polite and explained everything that was going on with my unit and made a recommendation for a new part to replace.”

– Reggie Sykes, ★★★★★, Polar Heating and Air Conditioning Google – Verified Review

“Setting up an apt was quick, easy, and painless. No one bothered me unnecessarily. Apts were available at 7am, which is great to take care of things before busy work hours.”

– Zeshan Aslam, ★★★★★, City & Suburban Heating & Cooling Google – Verified Review

Chicago homeowners swap these ageing-boiler experiences with each other constantly, and the r/AskChicago residential boiler thread is worth reading before you commit to anyone.

📞 Where do-it-yourself stops

Drain a little water monthly, change thermostat batteries, keep the area around the boiler clear, and watch for water where there should be none. That is the homeowner’s list.

Anything involving the gas valve, the venting, the combustion setup, or the pressure vessel is not on it. Gas valve pressure is set to the rating plate, and on some packaged units that maximum is 3.3 inches of water column, not 3.5.

City & Suburban Heating & Cooling started in 1952 doing exactly this work, when Rob’s father went door to door in Chicago offering furnace cleaning and maintenance, and it is still the cheapest line on any invoice we write. You can see how that began on the company history page.

The question I keep turning over is whether Chicago’s pre-war boiler stock gets replaced on its own schedule or on the DOE’s, if the 95% AFUE proposal lands. If you own one of these systems, I would genuinely like to hear what your last quote said, at (773) 238-3838.

 

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