Midwest · Climate zones 4–5
HVAC service in Illinois
Illinois has cold, snowy winters and hot, humid summers. Chicago's lakefront weather, central Illinois farm country and the milder south all need strong heating and dependable cooling.
- 677 ZIP codes covered
- 460 cities and towns
- Licensed contractors
Illinois HVAC at a glance
- Climate
- Cold (IECC zones 4–5)
- What it means
- Heating dominates. Furnace and boiler reliability, combustion safety and clear vents are the priorities, with summer AC still needed.
- Common systems
- Gas furnace + central AC, Boilers and radiators, Ductless mini-splits, Basement equipment
- Coverage
- 677 ZIP codes in 460 cities and towns
- Region
- Midwest
Homes & equipment
Heating and cooling in Illinois
Gas furnaces with central AC are standard in most homes. Chicago has many older two-flats, bungalows and apartment buildings with boilers and radiators, and some use window units or mini-splits for cooling.
Basements are common, holding furnaces and water heaters, and basement flooding can damage equipment.
Common problems
HVAC problems we see in Illinois
Frozen pipes during furnace failures
Subzero cold snaps make a failed furnace an emergency.
Humid summers
Humidity and heat waves strain undersized AC systems.
Older boiler systems
Chicago's older buildings need boiler service and radiator balancing.
City guides
HVAC city guides in Illinois
Other Illinois areas in our network
Contractors in our network also cover Springfield, Peoria, Aurora, Rockford, Bloomington, Schaumburg, Palatine, Naperville, Joliet, Elgin, Carol Stream, East Saint Louis, and 447 more communities. Enter your ZIP code in the request form to check yours.
Recommended
Services Illinois homeowners need most
Contractor licensing in Illinois
Illinois has no statewide HVAC license; cities such as Chicago license contractors and require permits locally.
Utilities in Illinois
ComEd serves northern Illinois and Ameren Illinois serves much of the rest. Nicor Gas, Peoples Gas and Ameren supply natural gas.
FAQ
Illinois HVAC questions
Do I need a licensed HVAC contractor in Chicago?+
Yes. Chicago licenses HVAC contractors and requires permits for most installations.
What should I do if my furnace fails in an Illinois cold snap?+
Call for repair right away, keep cabinet doors open under sinks, and use safe space heaters while you wait.
Other states in the Midwest
HVAC help in Illinois
Call to be connected with a licensed HVAC contractor serving your ZIP code, or send a request online.