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.
Charles Gilbert Gates
Charles Gilbert Gates (May 26, 1876 – October 29, 1913) of Minneapolis, Minnesota, who had owned the first home in the United States where air conditioning was installed in 1914. He was the son of John Warne Gates, also known as "Bet-a-Million" Gates.