Before the Next Cold Snap: 8 Chicago HVAC Companies to Know

Chicago homeowners ask a lot of their heating and cooling systems.

A furnace or boiler may run for months through freezing temperatures, then sit idle until the next heating season. A central air conditioner can go from barely used to running continuously during the first serious heat wave.

Those are also the moments when HVAC companies receive the most calls.

When the heat stops working in January or the indoor temperature keeps climbing in July, there is little time to compare contractors, examine estimates, or decide whether a repair recommendation makes sense. You are more likely to call whoever can arrive first.

The better time to find an HVAC company is while the system is still working.

The eight Chicago contractors below are worth knowing before the next breakdown, seasonal tuneup, or equipment replacement.

Chicago’s housing stock includes everything from new condominiums to century-old two-flats, brick bungalows, and vintage apartment buildings. Their heating and cooling systems can be just as varied.

Your home may use:

• a forced-air furnace with central air conditioning;
• a hot-water boiler and radiators;
• a steam boiler;
• a heat pump;
• ductless mini-splits;
• separate systems serving different floors;
• window or through-wall air-conditioning units alongside central heat.

The distinction matters. A company that works primarily with modern forced-air systems may not be the right choice for a temperamental steam boiler. A contractor familiar with radiators, older controls, and uneven heating can be especially valuable in a vintage Chicago property

Before calling, find the manufacturer, model number, approximate age, and service history of your equipment. Tell the contractor what type of system you have and describe exactly what has changed: unusual sounds, uneven temperatures, short cycling, leaking water, weak airflow, or a sudden increase in energy use.

The more specific you are, the easier it is for the company to prepare for the visit.

HVAC failures often become noticeable when the equipment is working hardest. That means homeowners across the city tend to call at the same time: during the first cold snap or the first sustained stretch of hot weather.

ENERGY STAR recommends annual pre-season maintenance, with cooling systems checked in spring and heating systems checked in fall. A professional inspection can uncover dirty coils, blocked drains, loose electrical connections, airflow problems, worn components, and combustion issues before they become more disruptive.

Maintenance cannot prevent every failure. It can, however, give you more control over when and how a problem is addressed.

The following companies are the first eight businesses currently shown in the BestProsInTown Chicago HVAC listings.

This is not a claim that one contractor will be the best choice for every home or every type of system. Each company has a different mix of experience, service coverage, emergency availability, and customer feedback.

Use the profiles as a starting point, then contact the contractor directly to confirm current services, availability, pricing, and experience with your equipment.

5736 N. Western Ave., Chicago, IL 60659

Oasis provides heating, cooling, plumbing, and water-heater services, with 24-hour availability listed throughout the week.

The company’s profile includes installation, maintenance, and repair work. Customer feedback also mentions full furnace and air-conditioning replacements, emergency response, and technicians who explain why a particular repair or system is being recommended.

One detail worth noting is the use of Manual J load calculations mentioned in reviews of replacement projects. A load calculation estimates how much heating and cooling a home actually requires. That is more reliable than automatically replacing an old unit with equipment of the same size or assuming a larger system will perform better.

Good to know: 24-hour availability, HVAC and plumbing services, routine maintenance, system replacement, and reported attention to equipment sizing.

4363 W. Montrose Ave., Chicago, IL 60641

All Temp has served the Chicago area since 1938 and handles furnace repair, air-conditioning replacement, system installation, and ongoing maintenance.

Recent customer feedback mentions furnace tuneups, humidifier problems, heating repairs, and technicians who worked around the homeowner’s schedule. The company lists 24-hour availability seven days a week.

Its long operating history may appeal to homeowners looking for an established contractor that handles both routine service calls and larger replacement projects.

Good to know: furnace and AC service, humidifier work, system installation, maintenance, and around-the-clock availability.

7850 S. Colfax Ave., Chicago, IL 60649

Burris & Sons combines heating, cooling, and plumbing services for residential and commercial properties. Its profile lists more than 60 years of experience and 24-hour service.

Having HVAC and plumbing experience within one company can be useful when a problem crosses the usual boundaries between trades. Boilers, water heaters, pumps, piping, and nearby leaks do not always fit neatly into a single service category.

Customer comments frequently mention direct explanations and a willingness to help homeowners understand what caused the problem rather than simply presenting a repair bill.

Good to know: HVAC and plumbing work, boilers, water heaters, residential and commercial service, and 24-hour availability.

5850 N. Northwest Highway, Chicago, IL 60631

Besco Air has served the area for more than 25 years and works with furnaces, air conditioners, steam heat, radiators, heat pumps, and ductless mini-splits.

That range is particularly relevant in Chicago. Older radiator and steam systems require a different diagnostic approach from conventional forced-air equipment, while heat pumps and ductless systems come with their own installation and service considerations.

Reviews often describe technicians explaining airflow, controls, dampers, and system operation rather than treating the visit as a quick parts replacement.

Good to know: experience with steam heat and radiators, heat pumps, ductless mini-splits, air purification, annual maintenance, and 24-hour availability.

1 E. Erie St., Chicago, IL 60611

Browns provides heating, air-conditioning, boiler, water-heater, ductwork, humidifier, and indoor-air-quality services.

Its profile lists EPA-certified and factory-trained technicians as well as flat-rate pricing. Recent customer feedback includes next-day air-conditioning appointments during a heat wave, furnace emergencies, duct leaks, humidifier installations, and situations in which technicians explained the cost before beginning the work.

Before scheduling, confirm the current diagnostic fee, whether it is applied to the repair, and what circumstances could change the original estimate.

Good to know: boiler and AC repair, ductwork, humidifiers, indoor-air-quality services, flat-rate pricing, and emergency response.

2914 N. Cicero Ave., Chicago, IL 60641

Brothers Heating & Cooling is a 24-hour contractor whose customer feedback frequently highlights diagnostics, communication, and second opinions.

One recent reviewer contacted the company after another contractor recommended replacing a six-year-old furnace. Brothers inspected the equipment, made smaller adjustments, and did not agree that replacement was necessary.

No single review proves that another contractor’s diagnosis was wrong, and some replacement recommendations are entirely justified. It does show why a second opinion can be valuable when the proposed work is expensive, the explanation is unclear, or the recommendation moves immediately from diagnosis to full replacement.

Good to know: troubleshooting, second opinions, heating repairs, homeowner education, and 24-hour service.

4300 W. Bryn Mawr Ave., Chicago, IL 60646

Deljo serves residential and commercial customers and lists 24-hour availability.

Customer feedback often describes technicians conducting detailed inspections, showing homeowners what they are seeing, and presenting multiple options. Recent reviews include furnace service, boiler evaluations, repairs, and replacement installations scheduled soon after the initial visit.

That kind of explanation is especially useful when an older system still operates but has reached the point where another major repair may not be the best long-term investment.

Good to know: furnace and boiler evaluation, repair-versus-replacement guidance, system installation, online estimates, and emergency availability.

5540 W. Lawrence Ave., Chicago, IL 60630

Heatmasters has served Chicagoland since 1950 and provides heating, cooling, installation, maintenance, and emergency service.

Its profile emphasizes long-term customer relationships and energy-efficient equipment. Customer feedback includes routine diagnostics, cleaning, repair work, and service for homes with more than one HVAC system.

For homeowners planning to remain in a property for years, continuity can matter. A contractor that knows the equipment’s history may be better positioned to identify recurring issues and distinguish a new problem from something that has been developing over time.

Good to know: seasonal maintenance, heating and cooling repair, multi-system homes, system installation, energy-efficiency guidance, and emergency service.

A useful diagnosis should leave you with a clearer understanding of the problem, not simply a price.

Before approving the work, ask:

• What caused the problem?
• Which component failed?
• Is this expected to be a lasting repair?
• Are other parts showing signs of wear?
• Is the system safe to operate?
• What is included in the estimate?
• Is the diagnostic fee applied to the repair?
• What warranty covers the part and labor?
• Does repairing the system still make sense given its age and condition?

Ask for the diagnosis and estimate in writing when the repair is expensive or involves several components.

For air conditioners, heat pumps, and other equipment containing regulated refrigerants, federal rules require technicians performing work that could release refrigerants to hold the appropriate EPA Section 608 certification.

“Your system is old” is not enough information on its own.

A proper replacement proposal should identify:

• the manufacturer and model;
• system capacity;
• efficiency rating;
• equipment and labor included;
• thermostat or control changes;
• required electrical or ductwork modifications;
• removal and disposal of the old equipment;
• manufacturer and labor warranties;
• permit responsibility;
• final project price and payment terms.

Ask how the contractor determined the correct system size.

Replacing old equipment with a unit of the same capacity may sound reasonable, but the existing system could have been oversized or undersized from the beginning. Changes to insulation, windows, additions, air sealing, or ductwork can also alter what the home requires.

Age matters, but it should not make the decision by itself.

An older furnace or boiler that has been maintained and needs a limited repair may still have useful life left. A newer system with recurring failures, poor installation, serious corrosion, major airflow problems, or an unsafe heat exchanger may present a different calculation.

Consider:

• the cost of the current repair;
• the frequency of previous repairs;
• whether replacement parts remain available;
• comfort differences between rooms;
• rising energy use;
• repeated shutdowns or unusual sounds;
• the condition of the ductwork;
• how long you plan to remain in the home.

When the answer is unclear, get a second opinion before committing to a major replacement.

Chicago does not treat every HVAC project the same way.

Certain repairs to existing equipment do not require a building permit. Replacing existing heating, ventilation, or air-conditioning equipment may qualify for the city’s Express Permit Program, while more extensive changes may involve additional requirements.

The contractor should be able to explain:

• whether a permit is required;
• who will apply for it;
• whether permit fees are included;
• whether inspections are required;
• whose name will appear as the contractor of record.

Do not assume permit handling is included in the price. Put the responsibility and cost in writing before the project begins.

You do not need to diagnose the system yourself, but keeping a simple record can make every service visit more efficient.

Save:

• equipment make and model;
• installation date;
• filter size;
• warranty information;
• previous invoices;
• service and maintenance history;
• thermostat model;
• the name of the last contractor who worked on the system.

Inspect the filter regularly and replace it according to the equipment and filter manufacturer’s recommendations. Keep outdoor equipment free from leaves and debris, and avoid blocking supply or return vents with furniture.

For boilers, steam systems, and radiators, avoid adjusting unfamiliar valves or controls based on generic online advice. Hot-water and steam systems can look similar while operating very differently.

Some HVAC problems can wait for a scheduled appointment. Others require immediate action.

Never treat a carbon-monoxide alarm as an ordinary furnace service call. Move everyone outside to fresh air, call 911 or the fire department, and do not reenter until emergency responders say it is safe.

Do not operate a suspected appliance again until it has been inspected by trained personnel.

If you smell gas or hear what may be a gas leak, leave the property immediately. Do not switch lights or electronics on or off. Contact the gas utility or emergency services from outside the building.

A contractor is easier to evaluate while the house is still comfortable.

Review the companies above and save two or three that appear suited to your home. One may be a good choice for seasonal maintenance, another for boilers or radiators, and another for an after-hours emergency.

You may not need to call today.

That is exactly why today is a good time to build the list.

Looking for more options? Explore the best heating and air-conditioning companies in Chicago on BestProsInTown.