| Gas-Fired |
| Greenheck Fan Corp. | http://www.greenheck.com/ |
| Gas-Fired |
| Reznor | http://www.rezspec.com |
|
| Modine Mfg. Co. | http://www.modine.com |
|
| Powermatic | http://www.powrmatic.com/ |
| Heating and Ventilating | Direct Fired | AAON, Inc. | http://www.aaon.com/ |
| Heating and Ventilating | Electric Resistance | AAON, Inc. | http://www.aaon.com/ |
| Heating and Ventilating | Indirect Fired | AAON, Inc. | http://www.aaon.com/ |
| Heating and Ventilating | Steam or Hot Water | AAON, Inc. | http://www.aaon.com/ |
| Heating and Ventilating | Direct Fired | Applied Air, Mestek, Inc. | http://www.appliedair.com |
| Heating and Ventilating | Electric Resistance | Applied Air, Mestek, Inc. | http://www.appliedair.com |
| Heating and Ventilating | Steam or Hot Water | Berner Intl. Corp. | http://www.berner.com/ |
| Heating and Ventilating | Direct Fired | Bessam-Aire, Inc. | http://www.bessamaire.com |
| Heating and Ventilating | Indirect Fired | Bessam-Aire, Inc. | http://www.bessamaire.com |
| Heating and Ventilating | Steam or Hot Water | Bessam-Aire, Inc. | http://www.bessamaire.com |
| Heating and Ventilating | Steam or Hot Water | Buffalo Air Handling | http://www.buffaloair.com |
| Heating and Ventilating | Direct Fired | Cambridge Engineering, Inc. | http://www.cambridge-eng.com |
| Heating and Ventilating | Direct Fired | CES Group, Inc. | http://www.ces-group.com |
| Heating and Ventilating | Electric Resistance | CES Group, Inc. | http://www.ces-group.com |
| Heating and Ventilating | Steam or Hot Water | CES Group, Inc. | http://www.ces-group.com |
| Heating and Ventilating | Direct Fired | Des Champs Technologies | http://www.des-champs.com/ |
| Heating and Ventilating | Electric Resistance | Des Champs Technologies | http://www.des-champs.com/ |
| Heating and Ventilating | Indirect Fired | Des Champs Technologies | http://www.des-champs.com/ |
| Heating and Ventilating | Steam or Hot Water | Des Champs Technologies | http://www.des-champs.com/ |
| Heating and Ventilating | Direct Fired | E.K. Campbell / Thomas & Betts | http://www.reznoronline.com |
| Heating and Ventilating | Indirect Fired | E.K. Campbell / Thomas & Betts | http://www.reznoronline.com |
| Heating and Ventilating | Direct Fired | Greenheck Fan Corp. | http://www.greenheck.com |
| Heating and Ventilating | Electric Resistance | Greenheck Fan Corp. | http://www.greenheck.com |
| Heating and Ventilating | Indirect Fired | Greenheck Fan Corp. | http://www.greenheck.com |
| Heating and Ventilating | Steam or Hot Water | Greenheck Fan Corp. | http://www.greenheck.com |
| Heating and Ventilating | Direct Fired | Hartzell Fan, Inc. | http://www.hartzellfan.com |
| Heating and Ventilating | Steam or Hot Water | Hartzell Fan, Inc. | http://www.hartzellfan.com |
| Heating and Ventilating | Direct Fired | Krack Corp. | http://www.krack.com |
| Heating and Ventilating | Direct Fired | Modine Mfg. Co. | http://www.modine.com |
| Heating and Ventilating | Indirect Fired | Modine Mfg. Co. | http://www.modine.com |
| Heating and Ventilating | Direct Fired | Reznor | http://www.rezspec.com |
| Heating and Ventilating | Indirect Fired | Reznor | http://www.rezspec.com |
| Heating and Ventilating | Direct Fired | Rupp Air Management Systems | http://www.ruppams.com |
| Heating and Ventilating | Steam or Hot Water | Rupp Air Management Systems | http://www.ruppams.com |
| Heating and Ventilating | Indirect Fired | Thermo-Cycler Industries Inc. | http://www.thermocycler.com |
| Heating and Ventilating | Direct Fired | Titan Air Inc. | http://www.titan-air.com |
| Heating, Ventilating and Cooling | Humidity Control | AAON, Inc. | http://www.aaon.com/ |
| Heating, Ventilating and Cooling |
| AAON, Inc. | http://www.aaon.com/ |
| Heating, Ventilating and Cooling |
| Air Enterprises, Inc. | http://www.airenterprises.com |
| Heating, Ventilating and Cooling |
| Berner Energy Recovery Inc. | http://www.bernerenergy.com |
| Heating, Ventilating and Cooling |
| Bessam-Aire, Inc. | http://www.bessamaire.com |
| Heating, Ventilating and Cooling |
| Bioclimatic, Inc. | http://www.bioclimatic.com
|
| Heating, Ventilating and Cooling |
| Cambridge Engineering, Inc. | http://www.cambridge-eng.com |
| Heating, Ventilating and Cooling | Humidity Control | CES Group, Inc. | http://www.ces-group.com |
| Heating, Ventilating and Cooling |
| Des Champs Technologies | http://www.des-champs.com/ |
| Heating, Ventilating and Cooling |
| Fujitsu General America, Inc. | http://www.fujitsugeneral.com/ |
| Heating, Ventilating and Cooling |
| Greenheck Fan Corp. | http://www.greenheck.com |
| Heating, Ventilating and Cooling | Humidity Control | Heat Pipe Technology, Inc., | http://www.heatpipe.com |
| Heating, Ventilating and Cooling |
| PEF Industries, Inc. | http://www.peftn.com |
| Heating, Ventilating and Cooling |
| Quietaire Corp. | http://www.quietaire.com/ |
| Heating, Ventilating and Cooling |
| Rapid Engineering, Inc. | http://www.rapidengineering.com |
| Heating, Ventilating and Cooling |
| Rupp Air Management Systems | http://www.ruppams.com |
| Heating, Ventilating and Cooling |
| Titan Air Inc. | http://www.titan-air.com |
| Heating, Ventilating and Cooling |
| XeteX, Inc. | http://www.xetexinc.com |