Sheet Metal and Air Conditioning Contractors’ National Association
SMACNA’s mission is to provide products, services, and representation to enhance members’ businesses, markets, and profitability.

American Society of Heating, Refrigerating and Air-Conditioning Engineers 
The Society is organized for the sole purpose of advancing the arts and sciences of heating, ventilation, air conditioning and refrgeration for the public’s benefit through research, standard writing, continuing education and publications.

Air-Conditioning & Refrigeration Institute
The Air-Conditioning and Refrigeration Institute (ARI) is the national trade association representing manufacturers of more than 90 percent of U.S. produced central air-conditioning and commercial refrigeration equipment. ARI’s national headquarters is located in Arlington, Virginia, across the Potomac River from Washington, DC.

Air Movement and Control Association
The Air Movement and Control Association International, Inc. (AMCA) is a not-for-profit trade association of the world’s manufacturers of air movement and control equipment – primarily fans, louvers, dampers and related air systems equipment. The association’s mission is to promote the health and growth of the air movement and control industry consistent with the interest of the public.

HPAC Engineering Interactive
HPAC Engineering Interactive serves the commercial and industrial HVAC/R and plumbing industries with an extensive library of on-line content.