Willis Haviland Carrier

Willis Haviland Carrier 

Willis Haviland Carrier started a company to make air conditioning systems. He figured out how to control temperature and humidity , which led him to develop modern air-conditioning . 

Carrier reasoned that for people to be comfortable especially on a hot day, both temperature and humidity should be controlled. He invented the air-conditioner to control both of these things. 

At first, air-conditioning was used in some factories. Now, air-conditioning is used in homes, cars, theatres, businesses, and schools.