Best HVAC Repairs in O Fallon, MO (2026)

3 verified businesses · Sorted by rating & reviews

1

SmartHouse Heating and Cooling

Google★★★★½4.9479 reviews
Yelp5 stars4.911 reviews
→ Stable·3 mo: 5★ (5)·6 mo: 5★ (12)
6921 Olive Blvd, St. Louis, MO 63130
+1314-451-5391
HVAC contractor
Call NowWebsiteView profile →
SmartHouse Heating and Cooling photo 1SmartHouse Heating and Cooling photo 2SmartHouse Heating and Cooling photo 3
2

Mckenny Services Heating & Cooling

Google★★★★½4.922 reviews
+1314-456-5114
HVAC contractor
Call NowView profile →
3

Diagnostic Heating & Cooling

Google★★★★★53 reviews
→ Stable·3 mo: 5★ (1)·6 mo: 5★ (1)
+1314-816-2016
HVAC contractor
Call NowWebsiteView profile →
Diagnostic Heating & Cooling photo 1