- Armstrong Air Conditioning, Inc.
 - Bellevue - Source for heating and cooling solutions. Allied Air Enterprises brings together the collective strengths of Armstrong Air, AirEase, Ducane, Concord, Magic-Pak, and Allied Commercial. - Babcock & Wilcox Power Generation Group
- Barberton - Designs, manufactures, engineers and constructs boilers and other power generation equipment.
- Bessam-Aire, Inc.
- Cleveland - Manufacturer of industrial evaporative cooling, make up air, combination heating and cooling, indirect fired air turnover, and custom built equipment.
- Brewer-Garrett Company, The
- Middleburg Heights - Heating, ventilating, air conditioning, and energy services.
- Buckeye Heating & Air Conditioning Supply
- Bedford - Distributors of sheet metal, heating, and air conditioning supplies.
- CEC Consultants, Inc
- Cleveland - Specializing in energy cost reduction, HVAC and facilities design, building comfort and indoor air quality services for major corporations.
- Gardiner Trane
- Solon - Serving the commercial HVAC needs of Northeastern Ohio.
- Geopfert Company
- Akron - HVAC company in Northeast Ohio servicing all commercial and industrial customers. Geopfert specializes in maintaining, servicing, and installing HVAC building controls, commercial chillers, steam and hot water boilers, packaged roof-top units, air handlers, and related equipment.
- Jennings Heating Co., Inc.
- Akron - Full service heating, air conditioning, ventilating, air purification, blower door, geothermal, humidification, and hearth products company.
- Kahoe Air Balance
- Eastlake - Testing, balancing, and commissioning heating, ventilating and air conditioning systems.
- Kiko Heating & Air Conditioning, Inc.
- Canton - Offers residential and commercial service.
- Mussun Sales
- Cleveland - Supplying Northeastern and Central Ohio contractors with heating, Ventilation and Air Conditioning products.
- Ozinga Systems
- Painesville - Heating, air condtioning, and plumbing service and installation serving the Lake County area.
- Process Power, Inc.
- Cleveland - Service centre for plate and frame heat exchangers.
- Stark Cooling & Heating
- Massillon - Installer of industrial, commercial, and residential heating and cooling systems.
- Western Reserve Energy Corp.
- Twinsburg - Manufacturers representatives of heating and ventilation equipment.
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