- AAON, Inc.
 - Manufacturer of rooftop heating and cooling units. - Alpha American Co.
- Manufacturer of multi-fuel furnaces operated from a thermostat using wood, coal, gas or oil.
 British Industrial Furnace Construction Association
- Offers resources to the furnace industry. Includes and event schedule, training, and news.- Can-Eng Furnaces
- Designer and manufacturer of industrial heat-treating equipment, furnaces, and related services.
- Marathon Heater Company
- Manufacturers of solid fuel burning heaters and boilers.
- Modern Equipment Company
- Manufacturer of aluminium melting furnaces, molten metal handling equipment, foundry equipment, inert gas generators, gas altmospheres, nitrogen generators, and tower melters.
- NY Thermal
- Developer of home heating equipment.
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