- Air Force A/C & Heating Systems
 - Newmarket - Industrial and commercial HVAC contractor. - Alltemp Products Company Limited
- Pickering - Manufactures and distributes various air conditioning, refrigeration, heating and ventilating, vacuum, appliance and electric motor and industrial pump parts throughout Canada.
- Arrow Heating & Air Conditioning
- Toronto - Authorised prime contractor for Consumers Gas.
- ATS Refrigeration
- Toronto - Specialises in sales, installations, and design builds. Authorised agents for Koma industrial blast freezing, storage, and dough conditiong systems.
- Berg Chilling Systems, Inc.
- Scarborough (Toronto) - Specialising in process cooling, chillers, cooling towers, pumping systems, marine and food processing refrigeration and ice machines.
- Certified Heating & Air Conditioning
- Pickering - Services and installs heating and air conditioning systems, and offers emergency repair service.
- Conserval Engineering
- North York (Toronto) - Produces Solarwall, a way to heat large buildings and to dry crops, and manufactures humidification systems. Office locations in Downsview, ON and Buffalo, NY.
- Dann Air Heating & Cooling
- Toronto - Offers residential and commercial heating and air conditioning installation, service, and maintenance.
- Husky Heating & Air Conditioning
- Concord - Provides commercial and residential heating and air conditioning (HVAC) services.
- Leader Fan Industries Limited
- Toronto - Manufacturer and distributor of industrial ventilation products.
- MaticAir Supply & Mfg. Ltd.
- Concord - Specialises in manufacturing heating and ventilation ducting equipment.
- National Filter Media Corp.
- Aurora - Air pollution control and liquid filtration products.
- Northern Industrial Fans and Blowers
- Pickering - Manufacturer of fans and blowers for industrial and commercial applications.
- United ThermoDynamics Corporation
- Toronto - Dealer and installer of HVAC products.
- Walker Heating and Air Conditioning
- Ajax - Distributes furnaces, hot water heaters, fireplaces, air conditioners, humidifiers, and indoor air quality products.
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