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American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
The National Electrical Manufacturers Association (NEMA) establishes motor standards such as frame size and insulation temperatures.
York International owns Luxaire and Coleman-Evcon
American Standard owns Trane.
Carrier owns Bryant & TempStar.
Rheem owns Weather King.
Electrolux owns Frigidaire.
Goodman Owns Amana-hac.