• Goodway Technologies Corporation

• Gordon-Piatt Energy Group

• Graham Mfg. Co.

• Growers Greenhouse Supplies Inc.

• Halco Products Co. Div.

• Heat Transfer Systems, Inc.

• Hubbell Electric Heater Co.

• Hurst Boiler & Welding Co., Inc.

• Hydrolevel Co.

• Hydrotherm Corp.

• INDEECO

• J.D. Gould Company, Inc.

• Johnson Controls, Inc.

• Johnston Boiler Company

• Joseph Davis

• Keltech Inc.

• Kemco Systems

• Kraissl Co.

• Kunkle Valves

• Lattner Boiler Manufacturing

• Lattner Boiler Mfg. Co.

• Leader Fan Industries Ltd.

• Leedy Electric Corporation

• Leslie Controls

• Lochinvar Corp.

• Ludell Mfg. Co.