AMCA International
Air Movement and Control Association International, Inc.

ARI
Air Conditioning & Refrigeration Institute

ASHRAE
American Society of Heating, Refrigerating and Air-Conditioning Engineers

ETL
Inchape Testing Services/ETL Testing Laboratories

HPAC

NIST

National Institute of Standards & Technology

SMACNA

U.S. DOE - Energy Network
U.S. Department of Energy

U.S. DOE - Building Energy Standards Program

Directory of HVAC
The FTP site for sci.engr.heat-vent-ac.... FAQ and more

Underwriters Laboratories Inc.
UL testing labs