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- A O Smith
- Aaon
- Acme
- Addison
- Aero Tech
- Air Dec
- Airtemp
- Amana
- American Air Filter
- Arcoaire
- Arkla
- Armstrong
- Aurora
- Baldor
- Bally
- Belding Gibson
- Bohn
- Boston Gear
- Broan
- Butler Ventilator
- Caloric
- Carrier, BDP
- Century Electric
- Chandler
- Climate Control
- Coleman
- Consolidated Industries
- Copeland
- Cornelius
- Crystal Tips
- Dayton
- Day/Night/Payne
- DuoTherm
- EMS
- Ebco
- Edison
- Emerson
- Emerson (Chromalox)
- Emerson Quiet Kool
- Evcon
- Fasco
- Fedders
- First Co
- Foster, Vulcan-Hart
- Franklin
- General Electric, MARS
- Gibson/Kelvinator
- Goodman/Janitrol
- Grainger
- Hayward
- Heatcraft
- Heil-Quaker/ICP
- Herman Nelsn
- Hill Refrigeration
- Hussmann
- ITT-Marlow
- Ice Cap
- Ice-O-Matic
- Indiana General
- Intertherm
- J & D
- Jandy / Waterpik
- Jenn Air
- Jet Spray
- Johnson Furnace
- Key Line
- Krack
- Kramer Trenton
- Larkin Coil
- Lear Siegler
- Leece Neville
- Leeson
- Leland Faraday
- Lennox Industries
- Liebert
- Lincoln
- Magic Chef
- Maintenance Warehouse
- Manitowoc
- Marathon
- McQuay/Snyder Gen
- Mid Continent
- Miller
- Morrill Motors
- Nordyne
- Nutone
- Pac Fab
- Packard
- Penn Vent
- Pentair/Purex RMR
- RV Products
- Redmond
- Reznor
- Rheem
- Robertshaw/Westward
- Rotom
- Scotsman
- Seimens
- Sid Harvey's
- Singer
- Sta Rite
- Sterling Radiator
- Supco
- Tappan
- Tecumseh
- Thermador (Trade Wind)
- Titus
- Toshiba
- Trane
- U.S.E.M.
- Unilux
- Universal Electric
- Universal Enterprise
- Wagner
- Weil McLain
- Westinghouse/Whisperaire
- Whalen Co.
- Whirlpool
- Whirlpool/Sears
- White Westinghouse
- Wood Heating
- York
- Young Radiator
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