| Recold Copper Coil Fluidcoolers and Evaporative Condensers | Marley Cooling Tower Company |
| Reconstruction Services, Competitive parts, and Accessories | Marley Cooling Tower Company |
| Refrigerant Detectors (Brasch) | Air Conditioning Specialties Co. |
| Refrigeration Equipment | DB Sales & Service |
| Refrigeration Research - Heat Exchangers and Specialties | Dawson Co. |
| Reliance-Variable Speed Drives & Motors | DMG Corporation |
| Replacement Chassis, Rooftop Multizone Units | McClintock & Bustad, Inc. |
| ReverberRay-Infrared Heaters | Haldeman, Inc. |
| Rez-Tek - Ozone Generators | JD Sales Co., Inc. |
| Reznor-Heating/Ventilating Make-Up Air Equipment | McClintock & Bustad, Inc. |
| Robicon - Variable Frequency Drives | Toro-Aire, Inc. |
| Roof Exhausters (Greenheck) | Airelink Products Corporation |
| Rotary Evap. Coolers | Haldeman, Inc. |
| Rovanco Piping Systems | JD Sales Co., Inc. |
| Ruskin Dampers & Louvers | Haldeman, Inc. |