- Accurate Heating & Air Cond
- Air Comfort Inc
- Air Products Heating & AC INC
- American Air Heating & AC
- Carrier West
- Comfort By Design
- Fort Collins Heating & A/C
- Fort Collins Winair
- Frugal Heating & Cooling
- Gary Hooley Heating & Air Cond
- Heat Exchange
- Northern Colorado Air Inc
- Poudre Valley Air
- Rix Heating & Air Cond Inc
- Rocky Mountain Air
- Tolin Mechanical Systems
- Trane Co
- Universal Mechanical Inc
