7 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 (7 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…”
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.