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.
Famous-Barr
Famous-Barr was created in 1911 through the merger of The William Barr Dry Goods Co. and previously May-owned The Famous Clothing Store. Famous-Barr was the first air conditioned department store in the United States. The store opened in Downtown St. Louis in 1914.