HVAC contractors in Illinois: 50 companies across 5 cities.
Illinois has 50 HVAC contractors listed across 5 cities. We check licenses against state records; we do not inspect workmanship. Most Illinois contractors listed here work in Chicago, where HVAC permits are pulled under a city General Contractor license from the Department of Buildings. Chicago, Arlington Heights, Evanston account for 88% of listings.
How Chicago licenses HVAC work
Most Illinois contractors listed here work in Chicago, where HVAC permits are pulled under a city General Contractor license from the Department of Buildings.
Who pulls an HVAC permit in Chicago
The Department of Buildings lists no separate HVAC or mechanical license. HVAC permits are pulled under a city General Contractor license, graded A to E by project value; the smallest grade covers jobs up to $500,000.
Fast route for common jobs
Like-for-like furnace or AC replacement, and a new AC or heat pump serving one unit, can go through the Express Permit Program. Rooftop equipment also needs a structural letter from an Illinois-licensed architect or engineer.
- Common HVAC jobs in Chicago need a permit, and a General Contractor doing home work must follow the city's home-repair consumer rules.
- An owner can skip the General Contractor requirement at their own home if it has 3 stories or fewer, 6 units or fewer and no commercial space, for one property a year.
- Minimum efficiency for new equipment: 13.4 SEER2 for split-system air conditioners (DOE North region, 2023 standard).
Sources, checked October 31, 2026: City of Chicago, General Contractor license; City of Chicago, Express Permit Program: mechanical work.
Where the contractors are
Listings and license-verified share for the 5 largest Illinois markets. The share varies by how each city's data was matched, not by how honest its contractors are.
Hiring HVAC help in Illinois
Answers specific to state rules. City pages add the local permit and utility details.
Is there an HVAC license in Chicago?
The Department of Buildings lists none. HVAC permits are pulled by a licensed General Contractor, and you can check a contractor on the city's licensed-contractor lookup.
Does replacing a furnace or AC in Chicago need a permit?
Generally yes. A like-for-like replacement qualifies for the Express Permit Program, which is quicker than a standard permit. Your contractor should pull it.
How do I check an Illinois HVAC license?
Ask the contractor for the license number and search it on the Chicago Department of Buildings (city) lookup (official site).
Why is one Illinois city mostly verified and another isn't?
It reflects how each listing reached us. Listings pulled straight from the license register verify at very high rates; listings that came from permit filings or public business profiles stay unverified until we can tie them to a license. A low share is a data gap, not a warning about the city.