- A/C Zincs
- Acetylene Supply Co
- ADP
- Advanced Distributor Products
- Air Filters
- Air Vent Inc
- AireTechnologies Inc
- Airtec
- All-Access by MSD Research
- American Water Heaters
- Amtrol
- Aprilaire/Research Products
- AquaGuard
- Aspen
- ATCO
- Atlanta Special Products
- Bacharach Inc
- Berry Global
- Black Malleable Iron Threaded Fittings
- Black Malleable Iron Threaded Pipe
- Black Steel Fittings
- Blackburn - Thomas & Betts
- Bluefin
- Boss Products
- Boston Valve
- Boyertown Furnace Company
- Boyertown
- Brass Ball Valves
- Broan
- Burnham by U.S. Boiler Company
- Butler Ventamatic
- Cain Mfg
- Caleffi Hydronic Solutions
- Cerro Flow Products
- Chigo USA
- ClimateMaster
- ComfortPro Systems
- Connecticut Electric
- Continental Industries
- Copeland
- Crete-Heat
- Crown Boiler Co
- Deflect-O
- Devco
- Diversified Heat Transfer
- DiversiTech
- Dunkirk
- Duracell
- DurkeeSox
- ECC Intl
- Eemax
- Everflow Supplies
- EWC Controls Inc
- EZ Trap
- Fantech
- Fernox
- Field Controls
- Fieldpiece
- First Company
- Flamco Precision Products Inc
- Flanders
- Flexcon Industries
- Fujitsu
- Gas Tanks & Refills
- General Electric
- Genesis
- Greenfield Industries
- Greenfield Manufacturing Co
- Gree
- Grundfos Pumps
- Hart & Cooley
- Heat Transfer Products
- Honeywell
- Hydrolevel Company
- Insulation and Liners
- Insulation
- J T Products
- Jones Stephens
- Legend Valve
- LG Electronics
- Lima
- Line Sets
- Little Giant - Franklin Electric
- Lloyd Industries Inc
- Lucas Milhaupt
- Lukjan
- Malco
- Marley Engineered Products - MEP
- MAXXEON
- Metal-Fab Inc
- Milwaukee Tools
- Modine Manufacturing Company
- Mueller Industries
- National Comfort Products
- National Comfort
- National Refrigeration Heating & Cooling
- Navien America Inc
- Nebels
- NIBCO
- Novent
- Oatey
- OmegaFlex
- Pamlico Air
- Panasonic
- Peerless Boilers
- PennBarry
- Pennco Boilers
- Pipe Vise
- Pipe
- Polyken Technologies
- Pro1 IAQ
- PROTECH
- PVC Sch 40 Fittings
- Quick-Sling
- Raypak
- RBI
- RectorSeal
- Reflectix
- Refrigerant Handling
- RenewAire
- Reznor
- Rheem
- Ruskin Rooftop Systems
- Schneider Electric
- Seal-Tite
- Sensible Products
- Sheet Metal
- Skidmore
- SlimDuct
- SMARTLOCK
- Southwark Metal Mfg Co
- Southwark
- Streamline by Mueller Industries
- Streamline PRS by Mueller Industries
- Symmons
- Taco Inc
- ThermO Manufacturing
- Thomas & Betts
- Tjernlund Products Inc
- Trion
- TRUaire
- TurboTorch
- Twin City Hose (TCH)
- UEI - Universal Enterprises Inc
- Ultravation Inc
- UltraVation
- Unico
- Uniweld
- Viega
- Watts
- WeatherKing
- Webstone Company
- Westwood Products
- Yellow Jacket/Ritchie Engineering
- Zonex
- Zurn Pex