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.
Franz San Galli
San Galli's claim as "the" inventor of the heating radiator is disputed. It appears that he is one of several people who contributed to the development of the heating innovation. San Galli received a radiator patent in 1857, while American Joseph Nason developed a primitive radiator in 1841 and received a number of U.S. patents for hot water and steam heating. Nason's patent for tapered pipe threads in particular is cited by 1930s writer Ara Marcus Daniels as the key development in the birth of the radiator.