8 HVAC Service Contractors in O'Fallon, MO
Top-Rated HVAC Service Contractors in O'Fallon
Hoff Heating & AC
“Every reviewer awarded five stars, with 1,515 total ratings reflecting consistent satisfaction. Customers frequently cited technician professionalism, same-day…”
Design Aire Heating and Cooling
“Eight reviewer accounts specifically mention receiving same-day or rapid-response service, with technicians taking time to explain system operation and…”
All HVAC Service Contractors (8 total)
Faszold Heating and Cooling
“870 reviews yield a 4.9-star average; positive feedback emphasizes sales transparency and clean installations…”
AAA Home Services
“Four of five named reviewers recount positive experiences citing individual technicians by name, while three…”
KirbnJays Heating & Cooling
“347 reviews yield a 4.9-star average, with every published rating awarding 5 stars. Multiple customers…”
Reliable Heating & Cooling Inc.
“Five of six sampled reviewers mention extended tenures with the company, ranging from 12 to over 30 years.…”
HVAC Service Costs in O'Fallon
General HVAC service pricing across maintenance, repair, and installation in O'Fallon.
| Service | Low | Average | High |
|---|---|---|---|
Service call / diagnostic | $81 | $130 | $216 |
Routine tune-up (single system) | $76 | $135 | $216 |
Standard repair (avg) | $162 | $648 | $1,296 |
Major repair (compressor, heat exchanger) | $1,620 | $2,700 | $3,780 |
New system installation (mid-range) | $7,020 | $11,340 | $15,120 |
Full HVAC replacement AC + furnace combined | $12,517 | $14,504 | $15,228 |
Prices reflect continental metro averages compiled from published industry cost guides, contractor surveys, and regional labor data. Last updated: April 2026.