23 8140 - Heat Pumps
- Airedale USA
- Amana Refrigeration
- American Geothermal
- American Standard
- Bard Manufacturing Company
- Bryant Heating & Cooling
- Carrier Corporation
- CGC Group
- ClimateMaster
- Cold Point
- EarthLinked Technologies
- Econar Energy Systems Corp.
- Enertran Technologies - (ETI) manufactures, Enertran Geothermal, Dehumification and "Specialized Energy Transfer" Systems which have been on the market since 1977.
- E-Tech - Air-source heat pumps specifically designed to heat water.
- FHP Manufacturing
- First Co. Products
- Geoflex Systems - Geoflex, manufactures, geothermal, energy transfer, heating, cooling and dehumidification systems.
- Goodman Manufacturing Company
- Heat Controller
- Hydro Delta Corporation
- Hydro-Temp Corporation
- International Comfort Products - Arcoaire, Heil, Tempstar, Comfortmaker
- KeepRite
- Klimaire Products
- Magic-Pak Products
- Mammoth-WEBCO - Custom air conditioning systems, innovation, energy efficiency, low sound levels and long-lasting products.
- Maritime Geothermal
- Marvair Airxcel
- Mammoth-WEBCO - Custom air conditioning systems, innovation, energy efficiency, low sound levels and long-lasting products.
- Mitsubishi Electric
- National Comfort Products
- Rheem Manufacturing
- Robur Corporation
- Ruud
- Skymark International
- Summit Manufacturing - MORTEX
- Trane - Trane is a manufacturer of air conditioning equipment, controls, service and parts for commercial buildings.
- Venmar CES - Energy-recovery ventilation systems with wheel, heat pipe, plate air-to-air heat exchangers, integrated dedicated outdoor air.
- WaterFurnace International
- Westair Industries
- The Whalen Company - Vertical stack fan coil unit and water source heat pumps.