HVAC Companies
- Acutherm
- Air Rover
- Alerton
- American Auto Matrix
- BAC – Baltimore Aircoil Company
- Bell & Gossett, ITT
- Brimar – Identification & Pipe Markers
- Bryant
- Building Automation Products Inc
- Burnham Boiler
- Carlin Combustion
- Cemline
- Cleaver Brooks
- Cobb Ind. – Portable Pipe Freezing Equipment
- Corcoran Co, R.S.
- Cuno Filters
- Danfoss Drives
- Desert Aire
- Domestic Pump, xylem
- Ductmate
- Dunkirk
- Dwyer
- Edwards Engineering
- Enviromental Corp.
- Evapco Cooling Towers
- FDI – Flow Design Inc
- Friedrich
- Greenheck
- Griswold
- Goulds Pumps
- Heat-Fab Stainless Steel Vent Pipe
- Highland Tank
- Hoffman-Specialty Products, xylem
- Honeywell
- Ingersoll-Dresser Pump Company
- ITT Standard
- Johnson Controls
- Lennox
- Mars Air
- Marsh
- McDonnell & Miller, xylem
- Mestek, Inc
- Metalaire
- Mitsubishi
- Mueller Company, Heat Exchangers
- Nautica
- Neptune Chemical Pumps
- Penn Ventilation
- Pep Filters
- Power Flame
- Raychem
- Recold
- Roberts Gordon
- Runtal Radiators
- Semco
- Slant Fin
- Spence
- Tate Andale
- Tekmar Controls
- Trane
- Venmar
- Victaulic
- Watts
- Weil McLain
- Weiss
- Wessels Tanks & Glycol Make-up Packages
- Wirsbo
- Yazaki