- C & S Manufacturing Corporation
- Cambridge-Lee
- Cambridgeport Air Systems
- Camco
- Carlyle
- Carrier
- Carrier, Bryant
- CEN Fabrications
- Century
- CGF Products
- Charlotte
- Cimport
- CL Ward
- ClenAir by Nu-Calgon
- Cleveland
- ClimateMaster
- Cliplight
- Coleman
- Comfort-Aire
- Comfortmaker
- ComStar
- Construction Solutions
- Cooper-Atkins
- Copeland
- CÔR™
- CPS
- Cresline
- Crown
- Crown Products
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