- Air Terminal Ltd
 - Manufacturers of aluminium air grilles, diffusers, louvres, and dampers. - Armstrong Pumps
- Manufactures circulators, hydronics, pumps, heat exchangers, and expansion equipment.
- Baxi Heating Ltd
- Manufacturer of boilers, gas and solid fuel fires, and wall heaters.
- Combat Engineering Ltd.
- Designs and manufactures gas and oil fired warm air heaters for use in industrial and commercial buildings.
- Cross Electrical (Nottingham) Ltd
- Specialises in the design, manufacture, supply and installation of electrical trace heating systems incorporating a thermal insulation division.
- Dunham Bush@
- Garbutt Heaters Ltd
- Manufactures tailor-made heating appliances suitable for gas, oil, LPG, direct and indirect fired.
- Gledhill Water Storage
- Manufacturers of copper cylinders and heating appliances. Suppliers to the trade only.
- Heatbusters
- Manufactures portable air conditioners.
- Hollingsworth & Vose Air Filtration Ltd
- Specialises in the manufacture of non-woven media for use in air filtration.
- Hyco Manufacturing Ltd.
- Makes and distributes water heaters, quartz heaters, hand dryers, and related products.
- Lanemark International Ltd.
- Involved in the design, manufacture, supply, and service of gas fired process heating equipment.
- Myson Ltd
- Manufacture radiators, fan convectors, towel warmers and other components for hot water central heating.
- Spirax Sarco - United Kingdom & Eire
- Provides steam users with knowledge, service, and products to improve and maintain steam heating and process plants.
- Vent Axia, Ltd.
- Manufactures and markets a range of fan products and accessories to provide domestic, commercial and industrial ventilation solutions.
- Villavent
- Manufactures heat recovery ventilation systems, air pollution filtering, and central vacuum systems for commercial, residential, and industrial applications.
- Weatherite Limited
- Manufacturers of bespoke air conditioning and air handling equipment.
- Wellman Robey
- Manufacturers of industrial boilers and pressure vessels.
- Woods of Colchester, Ltd.
- Designs and manufactures air movement equipment.
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