ACCA -- Air Conditioning Contractors of America
AGA -- American Gas Association
AHAM -- Association of Home Appliance Manufacturers
AMCA -- Air Movement & Control Association
ANSI -- American National Standards Institute
ARI -- Air-Conditioning and Refrigeration Institute
ARWI -- Air-conditioning & Refrigeration Wholesalers International
ASHRAE -- American Society of Heating, Refrigerating & A/C Engineers
CDA -- Copper Development Association
GAMA -- Gas Appliance Manufacturers Association
Geothermal Heat Pump Consortium
HRAI -- Heating, Refrigerating, & Air-Conditioning Institute of Canada
IIAR -- Inernational Institute of Ammonia Refrigeration
IHACI -- Institute of Heating and Air Conditioning Industries
MCAA -- Mechanical Contractors Association of America
NADCA -- National Air Duct Cleaners Association
NATE -- North American Technician Excellence Program
NEMA -- National Electrical Manufacturers Association
NHRAW -- Northamerican Heating, Refrigeration & A/C Wholesalers
PHCC -- Plumbing Heating Cooling Contractors Association
RSES -- Refrigeration Service Engineers Society
SMACNA -- Sheet Metal & A/C Contractors' National Assoc.
UL -- Underwriters Laboratories Inc.