- A C Brevan Inc
- A Stepping Stone Air Condition
- Aerotech Heating & Cooling
- Air Conditioning Options
- Air Dynamics
- Air Tite Heating & Air
- Al's Heating & Air Inc
- All-Star Air Conditioning Htg
- Ander Sons Inc
- Ander Sons Inc
- Andersons Inc
- Antrim Co
- Arnold's Air Control
- AWM Engineering Inc
- Barard Refrigeration & AC SVC
- Beaullieu & Assoc Inc
- Budget Heating & Air
- Captive Air Systems
- Captive Air Systems
- Captive Aire Systems
- Climate Engineers Inc
- Controls Center Inc
- Corporate Mechanical Svc Inc
- Elkhorn Engineering
- Florida Cooling Supply Inc
- Florida Load & Energy Assn
- Hy-Tech Heating & Air Cond
- Indusucon Corp
- J M KILBY Engineering Pa
- Kartchner Engineering
- M-K Engineering
- Marietta Mechanical
- Mc Dowell Engineering Inc
- Mcallister Contracting
- Mechanical Design & Consulting
- Mechanical Systems Engineers
- Mel Air Conditioning
- Midnight Control Svc
- Mpac Engineering
- Northern Indiana System Svc
- P I Corp
- Perfect Balance
- QED Engineering
- Quantum Group Engineering
- Quick Calcs Inc
- R S Consultants Inc
- Self Mechanical Svc Inc
- Service Advantage Inc
- Slade Ross Inc
- T & T Heating & Air Cond
- Turnstarr Properties Inc
- Val-Tec Enterprises
- Venco Air Systems
- Wilheck Air
- William A Lotz Consulting Engr
