1906, Willis Carrier was called "the father of air conditioning" by later generations because he invented the modern air conditioning system. Entrusted by the National Advisory Committee, an air conditioner simulating the polar climate was developed and used for the test of military aircraft. Because of its achievements in this respect, it won the "E" medal of the Air Force and Navy for six times, and Carrier's contribution to the development of American military industry is called "the greatest engineering achievement".

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His achievement lies in: designing safer and more efficient refrigeration and air conditioning, and letting air conditioning enter the homes of ordinary people.

In the first 20 years after the invention of air conditioning, the object of enjoying air conditioning has always been machines, not people, mainly used in printing houses and textile mills. With the popularization of air conditioning 1922, Carrier successfully developed a landmark product-centrifugal air conditioning, which greatly improved the efficiency and opened the door to large space air conditioning.

Carrier also improved the air conditioner, abandoned toxic ammonia for the first time and used safer refrigerant, which reduced the volume of the unit and created a precedent for comfortable air conditioning.

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