Willis Haviland Carrier, 26 November 1876 ¨C 7 October 1850), an American engineer and inventor, was the inventor of modern air conditioning systems. Dr. Willis Haviland Carrier was born in 1902 in Brooklyn, New York, and designed an air conditioning system that solved the problem of too high summer humidity and resulting in paper deformation that could not be printed. Over the next 100 years, the Keely Company, founded by Dr. Keely and Dr. Keely, was dedicated to the continuous innovation of air conditioning technology. Thro the long history, humans have been working passively, frustrated and discouraged in high temperatures, and can only pray for God¡¯s hand to drive the heat as quickly as possible, bringing cool, in some sense, the work of one of the world¡¯s most efficient companies, such as the