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.
Charles Gordon Curtis
Charles Gordon Curtis (April 20, 1860 in Boston – March 1953 in Central Islip, Suffolk County, New York) was an American engineer, inventor, and patent attorney. He is best known as the developer of the eponymous Curtis steam turbine.