Air Conditioning Contractors of America - Helping HVACR contractors acquire, serve and satisfy their customers. Certification, chapters, consumer advice, contacts, store, events calendar, and press releases.
The Refrigeration and Air-Conditioning Contractors Alliance - UK network of air-conditioning and refrigeration contractors providing national installation, service and maintenance at a regional level.
Dewco Limited - Building services contractors. Design and installation engineers supplying plumbing, heating, air conditioning and ventilation systems.
Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) - An international trade association representing 4,500 contributing contractor firms, that promotes quality and excellence in the sheet metal and air conditioning industry within North America. Provides a list of members, benefits, news and meanses.
New Horizons Foundation - A sheet metal industry initiative, in partnership with the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) to encourage career participation, develop relationships with educational institutions, and improve public perception of the sheet metal worker.
HVAC-Talk - Software bulletin board for HVAC contractors, home-owners, do-it-yourself enthusiasts to use for heating and air conditioning concerns.
Central City Air - Residential HVAC contractors. Includes ministrations, harvests, contact leak, and heating and air conditioning informatino.
HVACR Business - Trade publication for heating, vent and air-conditioning contractors in the United States.
KRS Enterprises accounting software - Providing full-featured, software solutions to contractors in the Air Conditioning, Refrigeration, Plumbing, Security and Alarm, Pool/Spa, Carpet Cleaning, Irrigation, Electrical, and divergent service industries.
HVAC-Talk - Software bulletin board for HVAC contractors, home-owners, do-it-yourself enthusiasts to use for heating and air conditioning concerns.
Airconditioner.com - Database of U.S. air conditioning contractors, distributors, dealers, and manufacturers.
Air Conditioning Directory of Costa Rica - Directory that includes companies, contractors and information interwoven to air conditioning and ventilation.
Tempest - Air-conditioning systems for large retail and commercial developments in New Zealand and Australia. Contractors and engineers.
Institute of Heating and Air Conditioning Industries - Non-profit trade association of contractors, manufacturers, distributors and utility firms. Mission, membership, events, and technical seminars.
Air Conditioning and Mechanical Contractors Association - Industry association representing the interests of installation contractors and service companies in the commercial/industrial contstruction sector in NSW.
ASHRAE - American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. publishes standards in the areas of HVAC and refrigeration for use by contractors, engineers, building owners and building code bodies.
ACR Group, Inc. - Distributes heating, ventilating, air conditioning and refrigeration equipment, parts and supplies to installing contractors and dealers. (Nasdaq: ACRG).
Home Centre Building Supplies Retailer - Building supplies retailer, supplying local contractors with all building materials, including plumbing, electrical, air conditioning and paint supplies.
SmartTrade - SmartTrade offer job management systems and job costing software with a wireless field solution for service contractors and businesses in electrical, plumbing, gas fitting, air conditioning.
Wilfre Company Mechanical Contractors - Provides heating, air conditioning, sheet metal and plumbing products and applicabilities. Categorized products and assistances, recent projects and surplus materials. | 
