BEL-O Cooling & Heating
A family-owned company since 1959 (founded as Belleville O'Fallon Heating & Cooling) offering heating, cooling, indoor air quality and plumbing for homes and businesses.
Lebanon, IL 62254 (location shown on its website)
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Heating & cooling (HVAC) companies in the Metro East
Furnaces, air conditioners, heat pumps and tune-ups.
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BELOMAN
A second-generation, family-owned heating, cooling and plumbing company serving the Metro East since 1959; also does architectural sheet metal.
5909 Cool Sports Road, Belleville, IL 62223
C&K Heating & Cooling
Family owned and operated since 1992, covering furnaces, air conditioning, geothermal heat pumps, water heaters, boilers and air purification.
1116 Galaxy Drive, Lebanon, IL 62254
Heritage Heating & Cooling
A family-owned, veteran-operated HVAC company in O'Fallon with a second location in Edwardsville, offering repairs, replacements, tune-ups and emergency service.
97 Betty Lane, O'Fallon, IL 62269
Archway Cooling & Heating
A family-owned residential and light-commercial HVAC company serving customers since 1969, with Trane comfort specialists.
O'Fallon, IL
Classic Aire Care
A St. Louis-area heating, cooling and plumbing company in business since 1926, with an Illinois office in Fairview Heights and 24/7 emergency repair.
13 Executive Dr, Fairview Heights, IL 62208
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Questions to ask before you hire
Do HVAC contractors need a state license in Illinois?
Illinois has no statewide HVAC license; any licensing and mechanical permits are set by your city or village. Technicians who handle refrigerant must hold federal EPA Section 608 certification.
Are there heat pump rebates in the Metro East?
Ameren Illinois electric customers can get instant discounts through participating contractors: $900 for a qualifying ducted air-source heat pump, $630 for a ductless mini-split and $115 for a smart thermostat (Ameren Illinois, checked November 2026). The federal 25C credit ended for equipment installed after December 31, 2025 (IRS).
What should an HVAC replacement quote include?
The brand and model numbers, the system size, efficiency ratings, the permit, removal of the old equipment, any ductwork or thermostat changes, and the labor warranty in writing. Ask whether any Ameren instant discount is already applied.
Repair or replace: what should I ask?
Ask for the repair cost in writing next to a replacement quote, the age and condition of the current system, and whether the repair comes with its own warranty. A good contractor will explain both options.
Full checklist: How to choose an HVAC contractor in the Metro East.