HVAC companies in O Fallon, MO 63366
17 HVAC companies, with local market data for this ZIP.
General contractors 47HVAC 17Roofing and exteriors 17Other construction trades 8Electricians 6Carpentry, drywall and windows 5Concrete and masonry 4Fences and decks 3Garage doors 3Remodeling 3Painting 2Excavation and demolition 2Flooring and tile 1
Area profitability, HVAC60 / 100Strong market, crowded field
Typical home value$364,000+1.9% in the past year
New homes permitted, 20251,661St. Charles County
Homeowners82.1%20,558 households
Source: Zillow (home value and housing demand in the score), data through Sep 2026. Permits and households: U.S. Census Bureau.
AAA Home ServicesHVAC contractor · 827 W Terra Ln, O Fallon(636) 397-3200 · aaastl.com
AAA Home ServicesHVAC contractor · 827 W Terra Ln, O Fallon(636) 397-3200 · aaastl.com
AAA Home ServicesHVAC contractor · 827 W Terra Ln, O Fallon(636) 397-3200 · aaastl.com
Absolute Comfort Systems Heating & Air ConditioningHVAC contractor · 1084 Cool Springs Industrial Dr, O Fallon(636) 978-5600 · absolutecomfortsystems.net
Air RescueHVAC contractor · 25 S Lang Dr, O'Fallon(636) 764-0700 · airrescuestl.com
Airbear Heating and Cooling STLHVAC contractor · 810 W Terra Ln, O'Fallon(636) 695-8788 · calltheairbeatstl.com
Craigco Heating & Cooling, LLCHVAC contractor · 15 Drury Ln, O Fallon(636) 978-5273 · callcraigco.com
Faszold Heating and CoolingHVAC contractor · 1613 E Terra Ln, O'Fallon(636) 259-2756 · faszold.com
Hoff Heating & ACHVAC contractor · 1520 Kemmar Ct, O Fallon(636) 388-4141 · hoffheating.com
KirbnJays Heating & CoolingHVAC contractor · 674 Whispering Willow Dr, O’Fallon(636) 233-1811 · kirbnjays-hvac.com
One Hour Heating & Air ConditioningHVAC contractor · 113 Triad Center W, O'Fallon(314) 899-2022 · onehourheatandair.com
Renaud Brothers Heating & CoolingHVAC contractor · 22 Christine Dr, O'Fallon(314) 620-3121 · renaudbrothershvac.com
Rippelmeyer ServicesHVAC contractor · 224 S Main St, O'Fallon(636) 240-5400 · rippelmeyerservices.com
RK Heating & CoolingHVAC contractor · 975 W Terra Ln, O Fallon(636) 242-5335 · callrkhc.com
Rogers Comfort SystemsHVAC contractor · 1084 Cool Springs Industrial Dr, O'Fallon(636) 978-5600 · absolutecomfortsystems.net
Sierra MechanicalHVAC contractor · 212 Crafton Dr, O'Fallon(636) 240-8383 · sierraheatingcooling.com
Stay Cool Climate ControlHVAC contractor · 407 Sonderen St, O Fallon(636) 747-1762 · staycool-hvac.com
Swiss Air Heating & Cooling, LLCHVAC contractor · 406 E Wabash St, O Fallon(636) 337-3008 · swissairstl.com
Aire Serv Heating & Air ConditiongHVAC contractor · 1253 W Terra Lane, O Fallon(636) 474-3878
Burke’s Heating and CoolingHVAC contractor · 2103 Martin Dr, O'Fallon(636) 466-9462
HVAC in ZIP 63366 at a glance
Local building angle: St. Charles County permitted 1,661 new homes in 2025, including 284 apartment units. 46% of the homes in this ZIP were built since 2000.
Local figures are estimates from public records and Zillow housing data, updated regularly.