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.
Cramerton, North Carolina
Cramer is credited with designing and equipping "about one-third of the new cotton mills in the South" between 1895 and 1915, and simultaneously acquiring extensive holdings in textile mills. Among Cramer's numerous industrial engineering patents was one for the "Cramer System of Air Conditioning", which included the automatic regulation of temperature and humidity. These early innovations in air conditioning resulted more from the need to remove lint from the air (a persistent problem in the textile mills) than to cool the factory atmosphere. The term "air conditioning" is attributed to Cramer.