<P> 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 American 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 . </P>
<P> 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 American 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 . </P>
when did the first air conditioner come out
when did the first air conditioner come out
1902
1902