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Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air. [37] The first inverter air conditioners were released in 1980–1981. [38] [39]
In 1939, Packard became the first automobile manufacturer to offer an optional air conditioning unit in its 1940 model year cars. [2] [3] These bulky units were manufactured by Bishop and Babcock (B&B), of Cleveland, Ohio and were ordered on approximately 2,000 cars. [4] The "Bishop and Babcock Weather Conditioner" also incorporated a heater.
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