Willis Carrier invented modern air conditioning
On this day · 17 July 1902
In 1902, a young engineer's fix for a humid Brooklyn print shop became the blueprint for modern air conditioning.
On July 17, 1902, a young research engineer named Willis Carrier completed drawings for what is now recognized as the world’s first modern, electrically powered air-conditioning system. His client was the Sackett-Wilhelms Lithographing and Publishing Company in Brooklyn, New York.
The printer had a stubborn problem. High summer humidity made paper swell and shrink, throwing off the four-color printing process so that inks no longer lined up. Carrier’s insight was that controlling humidity, not just temperature, was the key.
By managing moisture as well as heat, Carrier defined air conditioning as we still know it.
Installed across 1902 and 1903, his apparatus stabilized the plant’s air and launched an industry. Carrier went on to patent his “Apparatus for Treating Air” in 1906 and was later inducted into the National Inventors Hall of Fame. The comfort of modern offices, homes, and data centers traces back to that Brooklyn workshop.
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