Tang dynasty
The inventor Ding Huan (fl. 180 AD) of the Han dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered. In 747, Emperor Xuanzong had a "Cool Hall" built in the imperial palace, which the "Tang Yulin" () describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song dynasty, written sources mentioned the air conditioning rotary fan as even more widely used.
History of Chrysler
Airtemp invented capacity regulators, sealed radial compressors, and the self-contained air conditioning system, along with a superior high-speed radial compressor, and by 1941 had over 500 dealers selling its air conditioning and heating systems. The company supplied medical refrigeration units in World War II, and dominated the industry in the 1940s but slowly fell behind. By the 1970s Airtemp was losing money and was sold to Fedders in 1976. In 2012 the name was reborn as a Nordyne byproduct exclusively sold by the R.E. Michel Company.