Unit Heater Manufacturers
| Hauck Manufacturing Co (Lebanon, PA) |
| Heater Meal Co (Springdale, OH) |
| Industrial Thermal Systems (Fairfax, OH) |
| Infrared Internationale/N Amer (Comstock Park, MI) |
| Johnson Controls Inc (Smyrna, GA) |
| MAXON (Muncie, IN)
Manufacturer |
| Melt Design Inc (Saint Charles, IL) |
| Modine Manufacturing Co (La Porte, IN) |
| Semco Inc (Marion, OH) |
| Solaronics Inc (Rochester, MI) |
| Sun Air Conditioning Inc (Vienna, GA)
Manufacturer |
| Techno-Solis Inc (Clearwater, FL) |
| Therm Technology Corp (Grandville, MI) |
| Thermacore International Inc (Lancaster, PA) |
| Thermo Products Inc (North Judson, IN) |
| Thomas & Betts Corp (Mercer, PA) |
| Tocco Inc (Madison Heights, MI) |
| Warren Technologies Inc (Hialeah, FL) |
| Weil-Mc Lain Co (Michigan City, IN) |
| Evapco Inc Sales & Engnrg (Owatonna, MN)
Manufacturer |
| York Corrugating Co (York, PA)
Manufacturer |
| Industrial Engineering & Equipment (St. Louis, MO)
Manufacturer |
| A Pacific Shades Sun Control (Las Vegas, NV) |
| A-1 Heating & Air Conditioning (Greeley, CO) |
| A-1 Plumbing Supply (Chico, CA) |
