Research Products Corporation       This company manufactures the April-Aire humidifiers and the April-Aire media type air cleaners.

Gas Appliance Manufacturers Association     GAMA, the Gas Appliance Manufacturers Association, is a national trade association whose members manufacture appliances, components and related products used in connection with space heating, water heating and commercial food service.

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.  This site has a lot of industry related links as well as access to performance ratings for all heat pumps and air conditioners.

Air Conditioning Contractors of America    This is the site for the leading trade association in the HVAC industry.  The information is geared towards the HVAC contractor or other industry professional. 

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