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 F. Kettering
Charles Kettering built a house, "Ridgeleigh Terrace", in 1914. According to local sources, this house was the first in the United States to have electric air conditioning. Ridgeleigh Terrace was the home of his son, Eugene Kettering, until his death. Eugene's wife, Virginia Kettering, lived in the house for many years, restoring and redecorating it. In the late 1990s, the house was seriously damaged in a fire, but it was rebuilt according to the original blueprints.