| Absorption Chiller (Yazaki) | Air Treatment Corp. |
| Access Doors | Haldeman, Inc. |
| Access Doors (Greenheck) | Airelink Products Corporation |
| ACME - Fan Lin | Southern Ca A/C Distributors |
| ACME/Ketema Chillers | Conditioning Components Co. |
| Acutherm - Thermafusers | Toro-Aire, Inc. |
| ADOBE AIR - Evaporative Coolers | Southern Ca A/C Distributors |
| Aerofin Coils - DX, CHW, HW & Booster | Toro-Aire, Inc. |
| Air & Water Balance | American Air Balance Co., Inc. |
| Air and Water Balance | The Palt Company, A California Corp. |
| Air and Water - Cooled Reciprocating Chillers | York International Corp. |
| Air and Water - Cooled Rotary Screw Chillers | York International Corp. |
| Air Balance - Fire/Smoke/Control Dampers | Toro-Aire, Inc. |
| Air Bar (Air Performance) | Airelink Products Corporation |
| Air Concepts | Stark, Carroll G. & Associates |
| Air Concepts - Spot Cooling | Toro-Aire, Inc. |
| Air Conditioning (Environmaster) | Airelink Products Corporation |
| Air Conditioning Equipment | Haldeman, Inc. |
| Air Conditioning Units, Rooftop (Mammomth, Governair) | Air Treatment Corp. |
| Air Curtains | Haldeman, Inc. |
| Air Distribution | Haldeman, Inc. |
| Air Distribution (Enviro-Air) | Air Conditioning Specialties Co. |
| Air Distribution (Krueger) | Airelink Products Corporation |
| Air Handlers | DB Sales & Service |
| Air Handlers, Custom (Governair, Temtrol) | Air Treatment Corp. |
| Air Handlers, Custom (Pace) | DMG Corporation |
| Air Handlers, Rooftop (Governair, Temtrol, Mammoth) | Air Treatment Corp. |
| Air Handlers/Small Cabinet Fans (Gaylord) | Air Conditioning Specialties Co. |
| Air Handling Equipment & Fans - Pace Co. | DMG Corporation |
| Air Handling Units (Magic Air) (First Co.) | Airelink Products Corporation |
| Air Handling Units - Indoor and Outdoor Commerical, Semi-Custom and Custom | York International Corp. |
| Air Handling Units - Indoor, Outdoor, Custom | Trane Company, The |
| Air Monitor - Air Flow Monitor and Control | DMG Corporation |
| Air Purification Systems (Bioclimatic) | Air Treatment Corp. |
| Air Quality Controllers (Acme Engr. Products) | Airelink Products Corporation |
| Air-Cleaners | Haldeman, Inc. |
| Airfan Engineered Products | Haldeman, Inc. |
| Airflow Company | Dockendorf, W.G., Inc. |
| Airlink - Zoned VVT Systems | Engineered Comfort Systems |
| Airtherm - Air Handlers Fan Coils, Convectors | McClintock & Bustad, Inc. |
| American Air Filer - Unit Ventilators | Engineered Comfort Systems |
| American Warming - Louvers, Industrial Dampers | Toro-Aire, Inc. |
| Anemostat - Air Devices | Stark, Carroll G. & Associates |
| Anemostat - Door Louvers | Stark, Carroll G. & Associates |
| Anemosta t- Laminar Flow | Stark, Carroll G. & Associates |
| Anemostat - Maximum Security | Stark, Carroll G. & Associates |
| Anemostat - Terminal Units | Stark, Carroll G. & Associates |
| APCO - Check Valves, Pump Primters, High Capacity Air Vents | Dawson Co |
| Applied Air | .Haldeman, Inc. |
| Aqua Float 100 - External Water Level Controls | K.H. Watts Company, Inc. |
| Aqua Loop - Cooling Towers | Heat Technology Products |
| Ares Make-Up Units | Haldeman, Inc. |
| Arizona Air | Stark, Carroll G. & Associates |
| Artic Circle - Mastercool | Haldeman, Inc. |
| Aurora Pumps | K.H. Watts Company, Inc. |
| Aztec | Haldeman, Inc. |