Willis Carrier
Willis Haviland Carrier (November 26, 1876 – October 7, 1950) was an American engineer, best known for inventing modern air conditioning. Carrier invented the first electrical air conditioning unit in 1902. In 1915, he founded Carrier Corporation, a company specializing in the manufacture and distribution of heating, ventilation, and air conditioning (HVAC) systems.
Ice cube
American physician and humanitarian John Gorrie built a refrigerator in 1844 with the purpose of producing ice to cool air. His refrigerator produced ice which he hung from the ceiling in a basin to lower the ambient room temperature. During his time, bad air quality was thought to cause disease. Therefore, in order to help prevent and treat sickness, he pushed for the draining of swamps and the cooling of sickrooms.