| Manufacturer | Supplier | Supplier Info |
| AAON | Engineered Equipment, Inc. | Details.... |
| ABB | Engineered Equipment, Inc. | Details.... |
| AbsolutAire | RL Williams & Company | Details.... |
| Acme Manufacturing | Air Products Supply | Details.... |
| Acutherm | RL Williams & Company | Details.... |
| Aerofin Corporation | Process Equipment Company | Details.... |
| Air Concepts | RL Williams & Company | Details.... |
| Air Monitor Corporation | Engineered Equipment, Inc. | Details.... |
| Aircuity | Automated Buildings Systems | Details.... |
| AirGuard Industries | Process Equipment Company | Details.... |
| Ajax Boiler Company | Hambrick-Ferguson, Inc. | Details.... |
| Alerton Controls | Northwest Controls | Details.... |
| Alfa Laval Heat Exchanger | Hambrick-Ferguson, Inc. | Details.... |
| Amber Booth Company | Hambrick-Ferguson, Inc. | Details.... |
| American Ball Valves | Federal Corporation | Details.... |
| American Warming | RL Williams & Company | Details.... |
| American Wheatley HVAC Products | Hambrick-Ferguson, Inc. | Details.... |
| Amtrol | Hambrick-Ferguson, Inc. | Details.... |
| Annexair | Trane Company | Details.... |
| APC | EMCS | Details.... |
| Armstrong Pumps | Federal Corporation | Details.... |
| ASCO Valve | Federal Corporation | Details.... |
| Aurora Pump Company | Hambrick-Ferguson, Inc. | Details.... |
| Automated Logic Corp | Engineered Systems & Energy Solutions, Inc. | Details.... |
| AxAir Nortec | Engineered Equipment, Inc. | Details.... |
| Baltimore Aircoil Company | Hambrick-Ferguson, Inc. | Details.... |
| Barber Colman (see Schneider Elec.) | Federal Corporation | Details.... |
| Bard Air Conditioning | Federal Corporation | Details.... |
| Barnes Pumps | Federal Corporation | Details.... |
| Berner International | RL Williams & Company | Details.... |
| Bioclimatic Air Systems | RB Akins Company | Details.... |
| Bray Valves | Federal Corporation | Details.... |
| BRD | Trane Company | Details.... |
| Bryan Boilers | Boone & Boone Sales Company | Details.... |
| Buffalo Air Handling Co | Process Equipment Company | Details.... |
| Burks Pumps | Federal Corporation | Details.... |
| Calmac | Trane Company | Details.... |
| Camfil Farr | Engineered Equipment, Inc. | Details.... |
| Canariis Corporation | Hambrick-Ferguson, Inc. | Details.... |
| Carel Humidifiers | Trane Company | Details.... |
| Carrier Corporation | Carrier Oklahoma | Details.... |
| Carrier Corporation | Carrier Oklahoma | Details.... |
| Carrier Corporation | Carrier Oklahoma | Details.... |
| Carrier Corporation | Carrier Oklahoma | Details.... |
| Carrier Corporation | Carrier Oklahoma | Details.... |
| Cemline Corp. | Federal Corporation | Details.... |
| Cincinnati Fan Company | Process Equipment Company | Details.... |
| City of Oklahoma City / OCMAPS Trust | Architectural Design Group, Inc. | Details.... |
| CityScapes | Trane Company | Details.... |
| Clearwater Systems | RB Akins Company | Details.... |
| Cleaver Brooks | Hambrick-Ferguson, Inc. | Details.... |
| ClimaCool | Air Products Supply | Details.... |
| Climate Craft | Carrier Oklahoma | Details.... |
| ClimateMaster | Air Products Supply | Details.... |
| Coil Company | Federal Corporation | Details.... |
| ConsERV | Air Products Supply | Details.... |
| Cosatron | Engineered Equipment, Inc. | Details.... |
| Dadanco | Engineered Equipment, Inc. | Details.... |
| Daikin | Engineered Equipment, Inc. | Details.... |
| Data Aire | Trane Company | Details.... |
| Delta Cooling Towers | Trane Company | Details.... |
| Desert Aire | RB Akins Company | Details.... |
| Detroit Radiant | Boone & Boone Sales Company | Details.... |
| Donco | RB Akins Company | Details.... |
| DSP Monoxivent | RB Akins Company | Details.... |
| Ductsox | Engineered Equipment, Inc. | Details.... |
| Dynamic Air Cleaners | Trane Company | Details.... |
| Ebtron | RB Akins Company | Details.... |
| Econ-Air | RB Akins Company | Details.... |
| EHG Duct | RB Akins Company | Details.... |
| Energy Recovery, Inc. (Division of Nebraska Boilers) | Hambrick-Ferguson, Inc. | Details.... |
| Enviro-Tec | Engineered Equipment, Inc. | Details.... |
| Evapco | Boone & Boone Sales Company | Details.... |
| Exhausto | Hambrick-Ferguson, Inc. | Details.... |
| F E Myers | Boone & Boone Sales Company | Details.... |
| FAFCO | RB Akins Company | Details.... |
| Federal Pump Company | Hambrick-Ferguson, Inc. | Details.... |
| Fireye | Federal Corporation | Details.... |
| Flexmaster | RL Williams & Company | Details.... |
| Fulton Boiler | Trane Company | Details.... |
| Fulton Boilerworks, Inc. | Hambrick-Ferguson, Inc. | Details.... |
| General Electric Company | Hambrick-Ferguson, Inc. | Details.... |
| Gerand Engineering | Hambrick-Ferguson, Inc. | Details.... |
| Goulds | Boone & Boone Sales Company | Details.... |
| Goulds Pumps (G&L Division) | Hambrick-Ferguson, Inc. | Details.... |
| Governair | Engineered Equipment, Inc. | Details.... |
| Greenheck | Engineered Equipment, Inc. | Details.... |
| Halton | RB Akins Company | Details.... |
| Hamilton Engineering | Federal Corporation | Details.... |
| Hands Down Software | Hands Down Software | Details.... |
| Hardesty Team Co. | Hardesty Team Mechanical | Details.... |
| Hardesty Team Co. | Hardesty Team Mechanical | Details.... |
| Hardesty Team Co. | Hardesty Team Mechanical | Details.... |
| Hastings HVAC | RB Akins Company | Details.... |
| Hays Control Valves | Federal Corporation | Details.... |
| Hayward Valve | Federal Corporation | Details.... |
| Heat-Fab, Inc. | Federal Corporation | Details.... |
| HERO Fabriduct | Air Products Supply | Details.... |
| Honeywell Commerical & Industrial | Federal Corporation | Details.... |
| Howden Buffalo | RL Williams & Company | Details.... |
| Hurst Boiler | Federal Corporation | Details.... |
| HVAC CONTRACTOR | DeHart Air Conditioning | Details.... |
| Hydromatic Pumps | Hambrick-Ferguson, Inc. | Details.... |
| Hydronic Components, Inc. (HCI) | Hambrick-Ferguson, Inc. | Details.... |
| IEC Fan Coils | International Environmental Corporation | Details.... |
| ILD Technologies | EMCS | Details.... |
| Imeco | RB Akins Company | Details.... |
| INDEECO | Engineered Equipment, Inc. | Details.... |
| Industrial Steam | Federal Corporation | Details.... |
| Innovent | Trane Company | Details.... |
| ITT Bell and Gossett | Boone & Boone Sales Company | Details.... |
| ITT Domestic | Boone & Boone Sales Company | Details.... |
| ITT Hoffman | Boone & Boone Sales Company | Details.... |
| ITT McDonnell & Miller | Federal Corporation | Details.... |
| JenCo Fan | Air Products Supply | Details.... |
| Johnson Controls | Federal Corporation | Details.... |
| KE Fibertec | RB Akins Company | Details.... |
| Kunkle Relief Valves | Federal Corporation | Details.... |
| Laars Boilers | Federal Corporation | Details.... |
| Larkin | RL Williams & Company | Details.... |
| Layne/Verti-Line | Hambrick-Ferguson, Inc. | Details.... |
| Leader Industries | Air Products Supply | Details.... |
| lennox | DeHart Air Conditioning | Details.... |
| LG | Trane Company | Details.... |
| Liebert | RB Akins Company | Details.... |
| Lindab | RL Williams & Company | Details.... |
| Lochinvar Corporation | Hambrick-Ferguson, Inc. | Details.... |
| Loren Cook | RB Akins Company | Details.... |
| Luxaire | Air Products Supply | Details.... |
| Lynxspring - BACnet | EMCS | Details.... |
| M K Plastics | RL Williams & Company | Details.... |
| Mammoth Inc. | Engineered Equipment, Inc. | Details.... |
| Markel Products | RL Williams & Company | Details.... |
| Marley Cooling Tower | Process Equipment Company | Details.... |
| Maxitrol | Federal Corporation | Details.... |
| McGill AirFlow | Air Products Supply | Details.... |
| McQuay International | Engineered Equipment, Inc. | Details.... |
| Metal-FAB | RB Akins Company | Details.... |
| Metraflex | Boone & Boone Sales Company | Details.... |
| Miljoco | Boone & Boone Sales Company | Details.... |
| Milwaukee Valve | Federal Corporation | Details.... |
| Movincool | RB Akins Company | Details.... |
| MSA | RB Akins Company | Details.... |
| Multistack | Trane Company | Details.... |
| Munters | Engineered Equipment, Inc. | Details.... |
| Nailor Industries | RL Williams & Company | Details.... |
| National Combustion Equipment (Natcom) | Hambrick-Ferguson, Inc. | Details.... |
| National Systems of Garage Ventilation | Air Products Supply | Details.... |
| NEBB | Engineered Systems & Energy Solutions, Inc. | Details.... |
| Nebraska Boiler Co. | Hambrick-Ferguson, Inc. | Details.... |
| Nederman | Engineered Equipment, Inc. | Details.... |
| Neptronic | RB Akins Company | Details.... |
| OG&E Electric | OGE Electric Services | Details.... |
| Patterson-Kelley | Boone & Boone Sales Company | Details.... |
| Paul Mueller Company | Process Equipment Company | Details.... |
| Peerless Boilers | Federal Corporation | Details.... |
| Pelco | EMCS | Details.... |
| PEP Filters | Process Equipment Company | Details.... |
| Perry Fiberglass Products | Air Products Supply | Details.... |
| Phoenix | Automated Buildings Systems | Details.... |
| Poolpak | Trane Company | Details.... |
| Power Flame | Federal Corporation | Details.... |
| Power Quality, Inc. | RB Akins Company | Details.... |
| Preferred Utilities Manufacturing Company | Hambrick-Ferguson, Inc. | Details.... |
| Price | Engineered Equipment, Inc. | Details.... |
| Puroflux Corporation | Hambrick-Ferguson, Inc. | Details.... |
| Raypak | Boone & Boone Sales Company | Details.... |
| Recold | Process Equipment Company | Details.... |
| REYMSA | RB Akins Company | Details.... |
| Rite Boiler | Federal Corporation | Details.... |
| Ruskin | RB Akins Company | Details.... |
| Sanyo | Trane Company | Details.... |
| Schebler Corporation | Federal Corporation | Details.... |
| Schneider Electric - PowerLink | EMCS | Details.... |
| Schneider Electric - PowerLogic | EMCS | Details.... |
| Schneider Electric - VFDs | EMCS | Details.... |
| Schneider Electric (TAC/Barber Colman) | Federal Corporation | Details.... |
| Selkirk | Engineered Equipment, Inc. | Details.... |
| Semco | Trane Company | Details.... |
| SEMCO | RB Akins Company | Details.... |
| Semco | Engineered Equipment, Inc. | Details.... |
| Seresco | Engineered Equipment, Inc. | Details.... |
| Shipco Industries | Hambrick-Ferguson, Inc. | Details.... |
| Siemens Building Technologies | Siemens Building Technologies | Details.... |
| Siemens Building Technologies | Siemens Building Technologies | Details.... |
| SJE Rhombus | Hambrick-Ferguson, Inc. | Details.... |
| Skidmore Pumps | Federal Corporation | Details.... |
| Smart Controls | EMCS | Details.... |
| SMC Technologies, Inc. | SMC Technologies, Inc. | Details.... |
| Solaronics | Federal Corporation | Details.... |
| Sourcetec Industries | RL Williams & Company | Details.... |
| Spence Engineering | Boone & Boone Sales Company | Details.... |
| Spinnaker | RL Williams & Company | Details.... |
| Spirax Sarco | Federal Corporation | Details.... |
| Stan-Cor Pumps | Hambrick-Ferguson, Inc. | Details.... |
| Steele Plastics | Boone & Boone Sales Company | Details.... |
| Sterling Radiator Co. | Federal Corporation | Details.... |
| Strobic | Automated Buildings Systems | Details.... |
| Superior Radiant | RL Williams & Company | Details.... |
| SureFlow Fan Coils | International Environmental Corporation | Details.... |
| Swanda Brothers | Swanda Brothers, Inc. | Details.... |
| Swanda Brothers | Swanda Brothers, Inc. | Details.... |
| Swanda Brothers | Swanda Brothers, Inc. | Details.... |
| Systecon | Engineered Equipment, Inc. | Details.... |
| TAC | EMCS | Details.... |
| TAC | Automated Buildings Systems | Details.... |
| TAC (see Schneider Elect.) | Federal Corporation | Details.... |
| Tamco | RL Williams & Company | Details.... |
| TCF Clarage/Zurn | Process Equipment Company | Details.... |
| Technical Sytems | Boone & Boone Sales Company | Details.... |
| TECO Westinghouse | Federal Corporation | Details.... |
| Tekmar Control Systems | Hambrick-Ferguson, Inc. | Details.... |
| Tel-Tru Manufacturing Company | Hambrick-Ferguson, Inc. | Details.... |
| Temtrol | Engineered Equipment, Inc. | Details.... |
| Thermacor | Boone & Boone Sales Company | Details.... |
| Thermal Corporation | RL Williams & Company | Details.... |
| Thermal Solutions Boiler | Federal Corporation | Details.... |
| Thermo Tech | Hambrick-Ferguson, Inc. | Details.... |
| Thrush Company | Hambrick-Ferguson, Inc. | Details.... |
| Titus | RB Akins Company | Details.... |
| Tower-Flo | Hambrick-Ferguson, Inc. | Details.... |
| Trane | Trane Company | Details.... |
| Trane Rental Services | Trane Company | Details.... |
| TSI | Engineered Equipment, Inc. | Details.... |
| Tuttle & Bailey | Air Products Supply | Details.... |
| Twin City Fan & Blower | Process Equipment Company | Details.... |
| Twin City Fan Companies | RL Williams & Company | Details.... |
| Twin City Hose | Hambrick-Ferguson, Inc. | Details.... |
| Tyco Thermal | Boone & Boone Sales Company | Details.... |
| Tyco/Grinnell | Hambrick-Ferguson, Inc. | Details.... |
| United Air Specialists | Process Equipment Company | Details.... |
| United Enertech | Air Products Supply | Details.... |
| UVResources | Engineered Equipment, Inc. | Details.... |
| Van Packer | RL Williams & Company | Details.... |
| Vanton Pumps | Federal Corporation | Details.... |
| Venmar | Engineered Equipment, Inc. | Details.... |
| Vertiflo Pump | Hambrick-Ferguson, Inc. | Details.... |
| Vibro-Acoustics Systems | Process Equipment Company | Details.... |
| Viconics | EMCS | Details.... |
| Victaulic | Federal Corporation | Details.... |
| VRTX | Trane Company | Details.... |
| Vulcain | Engineered Equipment, Inc. | Details.... |
| Vulcan | Boone & Boone Sales Company | Details.... |
| Watts Radiant | Boone & Boone Sales Company | Details.... |
| Watts Regulator | Boone & Boone Sales Company | Details.... |
| Watts Regulator | Federal Corporation | Details.... |
| Webco Inc | Engineered Equipment, Inc. | Details.... |
| Weil McLain | Hambrick-Ferguson, Inc. | Details.... |
| Weil Pump Company | Boone & Boone Sales Company | Details.... |
| Weiss | Federal Corporation | Details.... |
| Wendland Manufacturing | Hambrick-Ferguson, Inc. | Details.... |
| Williams Furnace Company | Williams Comfort Products | Details.... |
| Wilo USA LLC | Air Products Supply | Details.... |
| Yaskawa | Boone & Boone Sales Company | Details.... |
| York | RB Akins Company | Details.... |