Manufacturers
- A
- A.W. Sperry Instruments
- Airgas
- Airserco
- Ajax Boiler
- Allen-Bradley
- Alnor
- Amana
- American Standard
- Amprobe
- Armacell / Armaflex
- Armstrong Insulation
- Atochem
- B
- Bacharach Instruments
- Baldor
- BDP
- Beckett Pumps
- Belimo
- Bell & Gossett
- Bramec
- Bray
- Bright Star
- Bristol Compressors
- Bryant
- Bussmann Fuses
- L
- LA-CO Industries
- Landis & Staefa
- Lau Industries
- Lectro Components
- LG (AC systems)
- LG (PTAC)
- Little Giant
- Love Controls/Dwyer
- M
- Mag-Lite
- Magicaire
- Mainstream Engineering Corp
- Malco Tools
- Mamac Systems, Inc.
- Maneurop Compressors
- Mars
- Mars Air Doors
- Marsh
- Marvair
- Mason Industries
- Maxitrol
- Maxxon
- McDonnell & Miller
- Metal-Fab
- Mill-Rose Co.
- Mitsubishi
- Mitsubishi Electronics America
- Mueller Refrigeration
- Mueller Streamline (formerly Copper)
- Rheem AC Products
- RIB
- Ridgid Tool
- Ritchie Engineering
- Robertshaw
- Robinair
- Rubatex Corporation
- Ruskin Manufacturing Co.
- Russell, HTPG
- Ruud AC Products
- S
- Sealed Unit Parts Co., Inc.
- Siemens Bldg. Tech., Landis Div
- Spectroline
- Sta-Rite
- Staefa Control Systems
- Standard Refrigeration Company
- Sun Tec
- Supco
- Superior Valve Co.
- System Sensor
- T
- Taylor Instr
- Tecumseh
- Tel Tru
- Teledyne Laars
- Tempstar Heating & Cooling
- Therma-Stor Products
- TITUS
- Tjernlund Products
- Triatek
- Tru Aire Registers & Diffusers
- Tru-Flex
- Tutco
- Y
- York
- A
- A.W. Sperry Instruments
- Airgas
- Airserco
- Ajax Boiler
- Allen-Bradley
- Alnor
- Amana
- American Standard
- Amprobe
- Armacell / Armaflex
- Armstrong Insulation
- Atochem
- B
- Bacharach Instruments
- Baldor
- BDP
- Beckett Pumps
- Belimo
- Bell & Gossett
- Bramec
- Bray
- Bright Star
- Bristol Compressors
- Bryant
- Bussmann Fuses
- H
- Hankison
- Hartell Pumps
- Heat-Timer
- Heatcraft
- Heil Heating & Cooling
- Highside Chemicals
- Hoffman Controls
- Honeywell
- Honeywell Analytics
- Hoshizaki
- Hot Shot
- L
- LA-CO Industries
- Landis & Staefa
- Lau Industries
- Lectro Components
- LG (AC systems)
- LG (PTAC)
- Little Giant
- Love Controls/Dwyer
- M
- Mag-Lite
- Magicaire
- Mainstream Engineering Corp
- Malco Tools
- Mamac Systems, Inc.
- Maneurop Compressors
- Mars
- Mars Air Doors
- Marsh
- Marvair
- Mason Industries
- Maxitrol
- Maxxon
- McDonnell & Miller
- Metal-Fab
- Mill-Rose Co.
- Mitsubishi
- Mitsubishi Electronics America
- Mueller Refrigeration
- Mueller Streamline (formerly Copper)
- P
- Packless
- Paragon Deforst Controls
- Paragon Timers
- Paul Mueller Company
- Payne Heating & Cooling
- Pelican Wireless
- PROMAX Industries
- Purolator Products Air Filtration Co.
- R
- Ranco
- Rectorseal Corp
- Refrigeration Research
- Refrigeration Technologies
- Rheem AC Products
- RIB
- Ridgid Tool
- Ritchie Engineering
- Robertshaw
- Robinair
- Rubatex Corporation
- Ruskin Manufacturing Co.
- Russell, HTPG
- Ruud AC Products
- S
- Sealed Unit Parts Co., Inc.
- Siemens Bldg. Tech., Landis Div
- Spectroline
- Sta-Rite
- Staefa Control Systems
- Standard Refrigeration Company
- Sun Tec
- Supco
- Superior Valve Co.
- System Sensor
- T
- Taylor Instr
- Tecumseh
- Tel Tru
- Teledyne Laars
- Tempstar Heating & Cooling
- Therma-Stor Products
- TITUS
- Tjernlund Products
- Triatek
- Tru Aire Registers & Diffusers
- Tru-Flex
- Tutco
- Y
- York