Local directory · O'Fallon, IL

HVAC Contractors in O'Fallon, IL

Written & reviewed by Founder, SEO Local · 22 years in SEO · Updated October 2026 · LinkedIn

There are 60 HVAC contractors in St. Clair County, IL according to the US Census (County Business Patterns). Below is a list of 18 of them from Google - 18 have phone numbers and 16 are linked to a website. All listings here are free and any owner can claim their page on the hashtag.org network.

HVAC Contractors directory · O'Fallon

Data: Listings via Google

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Local news · HVAC Contractors · O'Fallon

HVAC Contractors in O'Fallon — FAQ

How many HVAC contractors are in O'Fallon, IL?
According to the US Census (County Business Patterns), there are 60 HVAC contractor establishments in St. Clair County, IL, and 18 of them have been named and added to this directory.
How many of these HVAC contractors list contact details?
Out of the 18 HVAC contractors we've found, 18 have a phone number listed and 16 are linked to a website.
Is this O'Fallon hvac contractors directory free?
Each listing is created using accurate information from the US Census County Business Patterns and Google - and any company can claim its page on hashtag.org without paying anything.

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