Willis Carrier, American Inventor
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Carrier with his air conditioner. Willis Haviland Carrier (November 26, 1876 -October 7, 1950) was an American engineer. In 1902 he submitted drawings for the world's first modern air conditioning system. The 1902 installation marked the birth of air conditioning because of the addition of humidity control, which led to the recognition by authorities in the field that air conditioning must perform four basic functions: 1.) control temperature; 2.) control humidity; 3.) control air circulation and ventilation; 4.) cleanse the air. After several more years of refinement and field testing, on January 2, 1906, Carrier was granted US Patent 808, 897 for his invention, he called "Apparatus for Treating Air, " the world's first spray-type air conditioning equipment. The Great Depression slowed residential and commercial use of air conditioning. His igloo in the 1939 New York World's Fair gave visitors a glimpse into the future of air conditioning, but before it became popular, WW II began. During the post-war economic boom of the 1950s, air conditioning began its tremendous growth in popularity. He died in 1950 at the age of 73. No photographer credited, undated.