Adrian Steel Co.
Advanced Energy
AeroSys Inc
Affordable Comfort, Inc.
Air Conditioning Heating Refrigeration Institute (AHRI
Air Movement & Control. Association International, Inc. (AMCA)
Airgas
Airgas Refrigerants
Alliance to Save Energy
Amana
American Boiler Manufacturers Association (ABMA)
American Gas Association (AGA)
American Indoor Air Quality Council
American National Standards Institute (ANSI)
American Society of Association Executives (ASAE)
American Society of Heating, Refrigerating & Air-Conditioning Engineers 
American Society of Mechanical Engineers (ASME)
American Standard
American Subcontractors Association (ASA)
AO Smith
AprilAire
Arzel Zoning Technolgy Inc
Associated Air Balance Council (AABC)
Association for Facilities Engineering (AFE)
Association of Energy Engineers (AEE)
Association of Energy Services Professionals International
Bosch
Building Services Institute
Carbon Monoxide Safety Association
Carrier Corp
Chrysler Corp.
Clockwork Home Services 
Coil Company
Coleman 
Control Technologies
Danfoss
Diversitch-Wagner
Dodge Ram
Dynatemp

Edison Electric Institute

Electric Power Research Institute (EPRI)
Electronic Power Research Institute (EPRI)
Envirosense Consortium, Inc.
EWC
Fireye
Ford Motor Friedrich Air Conditioning
Fujitsu
Gas Research Institute (GRI)
GE Capital
Geothermal Energy Association (GEA)
Geothermal Energy Association (GEA)
Geothermal Heat Pump Consortium
GPS Technologies
Heating, Air-Conditioning, & Refrigeration Distributors, International
Heating, Refrigeration & Air-Conditioning Institute of Canada (HRAI)
Home Ventilating Institute (HVI)
Honeywell
HVAC Excellence
Hydronics Industry Alliance
Hydronics Institute
ICOR

ICS Blount
Idemitsu Lubricants America Corp.
Inficon
Jackson Systems
KM Facility Services
Lennox
LG Electronics
Luxaire
Master-Bilt
Masterack
Maxitrol Company
Mechanical Contractors Association of America (MCAA)
Mechanical Service Contractors of America (MSCA)
Modular Framing
National Air Duct Cleaners Association
National Association of Energy Service Companies
National Association of Home Builders. (NAHB)
National Association of Toxic Mold Remediators
National Association of Women in Construction (NAWIC)
National Board of Boiler & Pressure Vessel Inspectors
National Certified Pipe Welding Bureau
National Electrical Contractors Association
National Electrical Manufacturers Association (NEMA)
National Institute of Building Sciences (NIBS)
National Society of Professional Engineers (NSPE)
Nest Labs 
New Buildings Institute
Nexstar Network
Nissan
Nordyne
North American Technician Excellence, Inc. (NATE)
Panasonic
Plumbing Contractors of America
Plumbing, Heating, Cooling Contractors Association (PHCC)
PureChem
Quietside Corp 
Radiant Panel Association
Rectorseal
Refco Mfg
Refrigeration Service Engineers Society (RSES)
Rocket Media
Sage quest
Sanyo
Sensaphone
Source One
Spectronics
TACO
Testo Inc
The Energy Conservatory
Thermostat Recycling Corp
TPI
UEi
USA Coil and Air
Venture Tape
Visual Marking Systems
York