- Temperature Corporation
 - Markham - Specialising in industrial cooling and heating equipment. - Stelpro
- Richmond Hill - Manufacturer of electric heating products for residential, commercial, industrial, and architectural use.
- CoolBreezeAir
- Mississauga - Division of B.A. Della Penna Industries, Inc. Manufactures custom air handling units as well as dampers, acoustical plenums, and silencers.
- Sunwell Technologies Inc.
- Woodbridge - Manufacturer of industrial DeepChill slurry ice machines and ice storage and delivery systems for the marine refrigeration and food processing industries.
- Holly-Tech Limited
- Oakville - Manufactures refrigerated display case accessories.
- Secespol
- Mississauga - Manufacturer of shell and tube, shell and coil, plate and frame, brazed plate, and custom heat exchangers
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