• Powrmatic, Inc.

• QuickDraft Div.

• Quietaire Corporation

• R.L. Glendenning

• RSI Co.

• Rapid Engineering, Inc.

• Ready Access

• Rome-Turney Radiator Company

• Schaefer Fan Co.

• Sellstrom Manufacturing

• Siebring Manufacturing, Inc.

• Slant/Fin Corp.

• Solar Depot

• Solar Group

• Solarflo Corp.

• Solaronics

• Sparco

• Spirec N. A.

• Spirotherm

• Sterling HVAC Equipment

• Sun-El Corp.

• SunQest

• Suncourt Inc.

• Super Vacuum Mfg. Co.

• Supreme Fan Products

• Syndesis Inc.