HVAC businesses in Illinois
As of October 29, 2026, DealFlow OS tracks 2,446 HVAC businesses in Illinois, compared with 4,156 establishments with paid employees in the U.S. Census Bureau's 2022 County Business Patterns.
Updated
HVAC businesses
2,446
With a website
80%
With a phone number
99%
Build the Illinois hvac list
Open the Deal Finder with HVAC and Illinois prefilled — same 2,446 count, phone and website on every row.
Top cities
- 1.Chicago259
- 2.Aurora36
- 3.Elgin34
- 4.Des Plaines29
- 5.Naperville27
- 6.Champaign26
- 7.Schaumburg25
- 8.Springfield25
Compared with the Census
- DealFlow OS (October 29, 2026)
- 2,446
- Census CBP 2022 (NAICS 238220)
- 4,156
NAICS 238220: Plumbing, heating, and air-conditioning contractors. NAICS 238220 combines HVAC and plumbing contractors, so the Census figure covers both trades.
Source: U.S. Census Bureau, County Business Patterns 2022 — excludes sole proprietors (non-employer businesses).
Frequently asked questions
How many HVAC businesses are there in Illinois?
As of October 29, 2026, DealFlow OS tracks 2,446 HVAC businesses in Illinois, compared with 4,156 establishments with paid employees in the U.S. Census Bureau's 2022 County Business Patterns. Source: U.S. Census Bureau, County Business Patterns 2022 — excludes sole proprietors (non-employer businesses).
What share of HVAC businesses in Illinois have a website or phone number?
80% of the 2,446 HVAC businesses DealFlow OS tracks in Illinois list a website and 99% list a phone number.
Which cities in Illinois have the most HVAC businesses?
Chicago (259), Aurora (36), Elgin (34) lead the state.
Why is the DealFlow OS count different from the Census number?
County Business Patterns counts establishments with paid employees and excludes sole proprietors (non-employer businesses). DealFlow OS counts HVAC businesses found in public business listings, including owner-operators without employees. NAICS 238220 combines HVAC and plumbing contractors, so the Census figure covers both trades.
How do I get a list of HVAC businesses in Illinois?
Open the Deal Finder with HVAC and Illinois prefilled to see the same 2,446 count, preview the rows, and export the list with phone numbers and websites.
HVAC in other states
Other industries in Illinois
Thinking about buying one? How to acquire an HVAC business · HVAC by state