- AAON, Inc. - manufacturer of rooftop heating and cooling units.
- Acme Engineering & Manufacturing - manufactures commercial and industrial fans, blowers, exhausters, and power ventilators.
- Air-x-changers - manufactures custom-designed engine-driven and horizontal electric motor-driven air-cooled heat exchangers for the natural gas and process industries worldwide.
- AustinWare - specializes in fan selection programs.
- Cline Co. - providing services in plumbing, heating, air conditioning, construction services, electrical equipment, and telcommunication tower services.
- CMP Corporation - air conditioning & refrigeration compressor replacement parts manufacturer.
- Cust-O-Fab, Inc. - fabrication of heat exchangers, air cooled exchangers, vessels, towers, and bundles.
- G. C. Broach Company - building process heaters, boilers, and waste heat cogeneration systems.
- Hands Down Software - creates HVAC/R software. We produce extremely accurate psychrometric calculators and charts and many other tools. Our customers are engineers, manufacturers, reps and developers.
- Hughes-Anderson Heat Exchangers, Inc. - designs and builds shell and tube heat exchangers for the petroleum refining and petrochemical industries.
- International Environmental Corporation (IEC) - offers a variety of fan coil comfort products.
- Swanda Brothers, Inc. - specializing in fabrication and installation of industrial ventilation and dust collection systems, tanks and vessels, isolation enclosures, and jet engine test cells.
- Tower Tech, Inc. - builds, repairs and upgrades conventional water cooling towers.
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