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.
David Boswell Reid
Prof David Boswell Reid MD FRSE FRCPE (1805 – 5 April 1863) was a British physician, chemist and inventor. Through reports on public hygiene and ventilation projects in public buildings, he made a reputation in the field of sanitation. He has been called the "grandfather of air-conditioning".