- American Piping & Boiler Works
- Barnett Inc
- Better Deal Cellular
- Better Deal Cellular
- Bronkema & Sons Insulation Co
- Campbell Insulation
- Chicago Pipe & Boiler Covering
- Chicago Pipe & Boiler Covering
- Columbia Pipe & Supply Co
- Coverco Inc
- Dean Hall Insulation Co
- Eagle Inc
- Ed H Anderson Co
- Et Scott Insulation
- Iic Corp
- Industrial Maintenance Co
- Insulation Contracting Corp
- John Mansfield Insulation Co
- L & L Mechanical Construction
- MIS Insulation Inc
- Palmetto Insulation Co Inc
- Whertec Inc
- Yukon Insulation Co