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.
John Gorrie
Another version of Gorrie's "cooling system" was used when President James A. Garfield was dying in 1881. Naval engineers built a box filled with cloths that had been soaked in melted ice water. Then by allowing hot air to blow on the cloths it decreased the room temperature by 20 degrees Fahrenheit. The problem with this method was essentially the same problem Gorrie had. It required an enormous amount of ice to keep the room cooled continuously. Yet it was an important event in the history of air conditioning. It proved that Dr. Gorrie had the right idea, but was unable to capitalize on it. The first practical refrigeration system in 1854, patented in 1855, was built by James Harrison in Geelong, Australia.