| Applications | Companies Represented By Hill Company, Inc. |
| Air Conditioning Equipment | Aaon, Technical Systems |
| Air Filtration | BLC Industries, Luwa HVAC Filters |
| Air Handling Units | Aaon, Concepts and Designs, Haakon Industries, M&I Air Systems, Magic Aire |
| Chillers (Gas Engine) | Tecogen |
| Chillers (Evaporative Condensing) | Aaon, Technical Systems |
| Chillers (Reciprocating) | Technical Systems, GCI Industries |
| Chillers (Screw & Scroll) | Aaon, Technical Systems, GCI Industries |
| Coils | Aaon, Marlo, Pneumafil, Technical Systems |
| Condensing Units | Aaon, Technical Systems |
| Custom Air Handling Units | Aaon Airwise, Concepts and Designs, Haakon Industries, M&I Systems Engineering |
| Desiccant Dehumidification | Concepts and Designs, Haakon Industries, Seibu Giken |
| Dust Collectors | Luwa HVAC Filters |
| Electric Heat | Thermolec |
| Energy Recovery Units | Aaon, Haakon Industries, PoolPak, Xetex, Technical Systems |
| Evaporative Coolers | Concepts and Designs |
| Fan Coil Units | Aaon, Magic Aire |
| Fans | Chicago Blower |
| Heat Exchangers (Air) | Xetex, Seibu Giken |
| Heat Pumps | Aaon |
| Humidifiers | Armstrong |
| Make-up Air Units | Aaon, Concepts and Designs, Haakon Industries, M&I Systems Engineering |
| Pool Dehumidification Units | PoolPak |
| Refrigeration | Technical Systems |
| Rooftop Units | Aaon, Concepts and Designs, Haakon Industries, M&I Air Systems |
| Soft Starters | Saftronics |
| Sound Attenuation | Haakon Industries, M&I Air Systems |
| Sprayed Coil Units | Haakon Industries |
| Variable Speed Drives | Saftronics |
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