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| Air Conditioning Contractors of America Representing heating, ventilation, air conditioning, and refrigeration contractors. http://www.acca.org/ |
| Air Diffusion Council (ADC) Trade association for flexible duct manufacturers and suppliers in North America. http://www.flexibleduct.org/ |
| Air-Conditioning & Refrigeration Institute Representing manufacturers. http://www.ari.org/ |
| Alberta Pressure Vessel Manufacturers' Association Provides a forum for the pressure vessel and heat exchanger manufacturing industry. http://www.apvma.com/ |
| Australian Home Heating Association Represents the wood and gas heating industry, with information on natural heating, chimneys and combustion fuels. http://www.homeheat.com.au/ |
| Contractors 2000 Organization of plumbing, HVAC, and electrical contracors. http://www.contractors2000.com/ |
| Mechanical Contractors Association of America (MCAA) Welcome to the Mechanical Contractors Association of America, Inc. http://www.mcaa.org/ |
| Mechanical Contractors Association of Chicago The Mechanical Contractors Association of Chicago is the voice of the mechanical contracting industry. http://www.mca.org/ |
| Mechanical Contractors Association of Indiana Indiana trade association established to represent and service its members in the mechanical industry. http://www.mcai.com/ |
| Mechanical Contractors Association of New York Engages in collective bargaining, legislative action, education, professional development, and peer recognition. http://www.nymca.org/ |
| National Capital Chapter Non-profit trade association composed of, and of service to, elite contractors that make up the heating, ventilation, air conditioning and refrigeration (HVACR)industry in the District of Columbia, Maryland, and Virginia areas. http://www.acca-ncc.org/ |
| North Texas Chapter Professional organization of air conditioning contractors in the greater metroplex area. http://www.acca-ntx.org/ |
| PHCC of the Redwood Empire Local association of the plumbing, heating and cooling contractors. http://www.rephcc.org/ |
| Plumbing-Heating-Cooling Contractors Association A non-profit organization comprised of plumbing, heating, cooling contractors dedicated to the promotion, advancement, education, and training of the industry, for the protection of our environment and the health, safety, and comfort of society. http://www.naphcc.org/ |