Air conditioning
Modern air conditioning emerged from advances in chemistry during the 19th century, and the first large-scale electrical air conditioning was invented and used in 1902 by US inventor Willis Carrier. The introduction of residential air conditioning in the 1920s helped enable the great migration to the Sun Belt in the United States.
Philip Diehl (inventor)
The fan was invented in 1882 by Schuyler Skaats Wheeler. A few years later, Philip Diehl mounted a fan blade on a sewing machine motor and attached it to the ceiling, inventing the ceiling fan, which he patented in 1887. Later, he added a light fixture to the ceiling fan. Later in 1904,Diehl and Co. added a split-ball joint, allowing it to be redirected; three years later, this developed into the first oscillating fan.