• AAON

• AC&C Painting and Plastering, Inc.

• Adams Rite Manufacturing Co.

• Addison Products Co.

• Amana Appliances

• American Geo Thermal

• American Standard Heating and Air Conditioning

• Arcoaire Heating & Cooling Products

• Bard Manufacturing Company

• Canadian Cedar Log

• Chain Link Systems

• Climate Master, Inc. - USA

• Comfortmaker

• Commercial Environmental Systems Group

• Compu-Aire

• Data Aire

• Edward J. Cansino & Associates

• Edwards Engineering Corp.

• Enviromaster International

• Evcon Industries (York International Corp.)

• F H P Mfg.

• First Co.

• Francer Industries

• Friedrich Air Conditioning Co.

• Gordon R Williams Corporation

• Heat Controller, Inc.

• Heil Heating & Cooling Products

• Ice-Cap, Inc.

• International Comfort Product

• Joseph Davis

• Koldwave

• Ludell Mfg. Co.

• Mammoth, Inc.

• Marvair

• McQuay International

• NRG Equipment Inc.

• NYLE Dry Kiln Systems

• Nordyne

• Recreonics, Inc.

• Sanyo Air Conditioning Product

• The Whalen Company

• Trane Co.

• Trane Company

• Trent Technologies

• Trevor-Martin Corp

• Water Furnace International

• Waterfurnace

• York International Corp.