Rooftop AC Unit Installation, Repair & Maintenance in Chicago

It is more than a lift. A sound job covers a load check, a roof and curb survey, the City paperwork and a crane date. Then the old unit comes off, the new one is set and sealed, and power, gas, drain and controls are connected and tested under load. City & Suburban installs American Standard equipment. An owner should ask whether a given unit size fits the contractor's service scope. For whole-building work, see commercial HVAC services.

Routine repair and maintenance often need no City permit, while replacing a unit generally does, and the Department of Buildings has the final word. A structural review may be needed where the new unit's weight or curb changes, and the Department of Buildings confirms what applies. An owner should ask for both unit weights early, because they show whether the roof load changes. Suburban buildings follow the village's own permit rules. Refrigerant work also needs federal Section 608 certification.

Roof location can change the job more than the unit does. A tall parapet, a setback unit or a narrow alley can rule out the usual lift, and that narrows who will bid. JC wrote in a Jul 2026 Google review: "Two other companies would not even quote the job due to the roof location of the compressor." That job appears to have been a split system, so an owner should still ask how a packaged unit's lift would be planned. Ask who gets any crane or street permit, too.

About 15 to 20 years is the general planning figure, and grease or skipped service can shorten it. Age alone does not decide. A second compressor failure, a rusted base pan, a cracked heat exchanger or a leak on R-22 all point toward replacement. New R-22 has not been made or imported since 2020, so service relies on existing and reclaimed supply. A planned swap also lets the owner pick the lift date and compare bids without a dead unit overhead.

Most calls come down to a short list. Capacitors and contactors wear from constant cycling. Belts stretch, drains clog, and outdoor coils mat with cottonwood and grease. Gas units add igniters, flame sensors and inducer motors. Compressors and heat exchangers are the large repairs, where a second price makes sense. City & Suburban repairs all makes and diagnoses before quoting, so the fault is named before any price. For faults on split systems as well, see commercial AC repair services.

Usually a condenser. That is the outdoor half of a split system, with a furnace or air handler indoors, and AC condenser repair is the service to book. A rooftop unit, or RTU, holds the compressor, coils, fans and often a gas burner in one cabinet, with ducts dropping through a curb. No matching equipment indoors is the quick sign of an RTU. In a condo, the association usually controls the roof, so check its approval and insurance needs early. Brandi C. wrote in a Jun 2026 Google review: "Carissa was great staying on top of my slow-replying HOA to get the insurance info processed before Rob showed up."

Usually without new equipment. A worn bearing, a slack belt or a failed isolator sends vibration through the curb into the space below. City & Suburban diagnoses before quoting, so a small repair gets a fair look before anyone prices new equipment. On a condo roof unit, Aranya T. wrote in a Sep 2021 Google review that Rob "added some extra insulation to cut down on vibrations". A new unit's rated sound level belongs on the quote when neighbors sit close.

Size sets the starting point, and the roof often moves the total. The simplest swap fits the old curb, lifts easily and uses the same power and gas. An adapter or new curb, a long crane reach, a structural review, permits and new wiring all add cost. A written quote that names each of those items can be compared with another bid. City & Suburban puts the exact price in writing before work begins.

The structural review, permit and crane usually take longer to line up than the work itself. The lift is short, and most of the time goes to hookup and testing. The space loses heating or cooling while the unit is disconnected, so early starts and slow seasons help a business stay open. A building with several units can often be swapped in phases. Asking for the lift date and the expected shutdown hours in writing helps the business plan around the swap.

Some cases should not wait. A gas smell, smoke, a strong burning smell or a CO alarm means everyone leaves, then calls 911 from outside, and calls the gas utility for a gas odor. No heat in freezing weather puts pipes and tenants at risk. Water near lights or electrical panels means the unit goes off and people stay clear. A building contact who knows the roof access can save time on that call. City & Suburban runs emergency HVAC service 24/7. For commercial breakdowns, see emergency commercial repair.

Two visits a year suit most units that both cool and heat. Spring work covers coils, drain, belts, electrical parts and refrigerant readings. Fall work covers the burner, flue, heat exchanger and safety controls. Kitchens, salons and long-hour spaces load filters and coils faster, so they need more. A spring visit can also find a weak part before the first hot spell. Chicago's Ventilation Bureau also lists commercial buildings among those it inspects once a year. City & Suburban offers seasonal check-ups.

No. Some new units fit the old curb, especially from the same maker, and others need an adapter or a new curb. An adapter bridges the old curb and the new unit, and it leaves the roof membrane uncut. A new curb opens the roof and often brings in a roofer, which can suit a curb that is rusted or leaking. A sound survey measures the curb, its openings and its condition. The quote should name the route and any roofer's price, so bids compare fairly.

The lease decides, so read it before the quote. Some Chicago leases give the tenant upkeep and the landlord replacement, and others bill everything back. Naming who approves the price avoids a finished quote nobody can sign. Roof access and insurance papers often go through the landlord too. City & Suburban puts the exact price in writing before work starts, so the person who signs can compare it with another bid.

Under EPA's Technology Transitions rule, new packaged units on R-410A could not be made or imported from January 1, 2025. New equipment moves to refrigerants such as R-454B or R-32, which are rated mildly flammable and are not drop-ins for an older unit. Existing R-410A units can still be serviced, and a May 2026 EPA change lets older stock still be installed, so ask which refrigerant a quote uses. Units of 65,000 Btu/h and up built since January 1, 2023 meet a higher federal efficiency floor under 10 CFR 431.97, with another step on January 1, 2029. ComEd and Peoples Gas run business efficiency programs worth checking before choosing a model.

City & Suburban averages 4.98 across 204 Google reviews and holds 4.9 from 251 Yelp reviews. The company carries a BBB A+ rating and offers a satisfaction guarantee. It has been family-owned since 1952 and is run by Rob, the second generation. Most reviews come from homes and condos. Christopher A. wrote in a Jun 2025 Google review about an install with roof access: "They get full marks for hauling the equipment up five flights of stairs to the roof!" An owner comparing bids can ask each one for comparable rooftop jobs, license and insurance papers, any tonnage limit and the labor warranty.

Three habits do most of the work. Filters get changed on a schedule that fits the space. Coils get cleaned before the first hot spell, and again after cottonwood season if needed. Drains get flushed, so water leaves by the drain and not the ceiling. That schedule belongs in commercial AC maintenance visits. City & Suburban maintenance plan members get priority dispatch and member discounts. For plan options, see the custom maintenance plan page.