Top Rated Heating & Air Conditioning Contractors Serving St. Clair County, IL
Last Updated May 15, 2026
5947 Review Ratings and 3 Heating & Air Conditioning Companies Evaluated.
These companies have passed our Preliminary 5-step rating process.
Morrison Plumbing, Heating, Air, & Electrical Services
Morrison Plumbing, Heating, Air, & Electrical Services offers various heating and air conditioning services to residential and commercial clients in St. Clair County. The company is qualified to work on everything from air conditioner repairs and HVAC upgrades to HVAC installations and indoor air quality testing, and it prioritizes clear communication and customer satisfaction on every project.
Services
Heating & Air conditioning Contractors including air conditioning, hvac installation, heat pump repair, water heater repair, hvac replacement, plumbing, electrical, home generators and drain.
Coverage Areas
The St. Louis Area, including St. Clair County—key cities including Mascoutah, National Stock Yards, Belleville, East Carondelet, Fairview Heights, Dupo, Caseyville, Lovejoy, East Saint Louis and Scott Air Force Base.
- 8124B Bunkum Rd
- Caseyville, IL 62232
Archway Cooling & Heating
Archway Cooling & Heating offers a variety of heating and air conditioning services to residential and commercial clients throughout St. Clair County. The company has the training and equipment to handle everything from energy efficiency audits and mini splits to thermostat installations and furnace repairs, and its employees focus on delivering first-rate workmanship on every project.
Services
Heating & Air conditioning Contractors including ductless heating and cooling systems, mini splits, commercial air conditioning, hvac replacement, furnace repair, heat pumps and indoor air quality.
Coverage Areas
The St. Louis Area, including St. Clair County—key cities including Lovejoy, East Carondelet, National Stock Yards, Belleville, Mascoutah, Dupo, East Saint Louis, Fairview Heights, Scott Air Force Base and Caseyville.
- 620 E Grant St
- Belleville, IL 62220
Weir Heating & Cooling
Weir Heating & Cooling offers heating and air conditioning services to residential and commercial clients in St. Clair County. The company handles everything from indoor air quality testing and HVAC upgrades to energy efficiency audits and heat pump repairs, and its employees focus on delivering first-rate workmanship on each job.
Services
Heating & Air conditioning Contractors including heat pump repair, commercial air conditioning, air conditioning, air conditioner repair, hvac installation, furnaces, heat pumps and geothermal systems.
Coverage Areas
The St. Louis Area, including St. Clair County—key cities including Belleville, Caseyville, Dupo, National Stock Yards, East Saint Louis, Fairview Heights, Scott Air Force Base, Mascoutah, Lovejoy and East Carondelet.
- 111 Jerome Ln
- Cahokia, IL 62206
These companies have earned our Pre-Qualified Rating. Learn more about our 5-step process.
Rating Step 1 = Stars
Meet or exceed a
ONE AllRatings star score of 4.5.
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Read ONE AllRatings methodologyRating Step 2 = License
Verified active and in good standing (when required).
State license bureau data is accessed and analyzed.
Rating Step 3 = Background
Satisfactory status.
Internet searches were performed seeking disqualifying information on each company.
Rating Step 4 = Complaints
Satisfactory status.
Complaint bureau records have been searched seeking disqualifying information on each company.
Search Better Business BureauRating Step 5 = Specialist
Satisfactory status.
Our research specialist verifies all ratings steps have been passed and creates a final report and profile.
Meet our research specialist team
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