Willis Carrier and the Invention of Summer

There is a man whose name most people do not know who changed the way almost every human being on earth spends their summer. His name was Willis Haviland Carrier, and he grew up in Angola, New York, studied engineering at Cornell, and arrived at the Sackett and Wilhelms Lithographing Company in Brooklyn in nineteen oh two with a problem to solve.

The lithography company was having trouble with its paper. Heat and humidity made the paper expand and contract, throwing off the ink registration on four-color printing. Carrier was tasked with controlling the humidity. He arrived at a machine that pushed air over chilled coils, removing moisture as the air cooled. It worked. The paper held.

What he had built, at age twenty-five, was the first true modern air conditioning system.

He spent the next decade refining the theory and on December third, nineteen eleven, presented what his peers called the Magna Carta of Psychrometrics, a document that precisely defined the relationships between temperature, humidity, and air movement, and made it possible for engineers anywhere to design climate control systems from first principles.

In nineteen fifteen, he co-founded the Carrier Engineering Corporation with six other engineers. The company moved through several cities before consolidating in Syracuse in nineteen thirty-seven. It became one of the largest employers in central New York. A facility on Thompson Road opened in nineteen forty-seven, built to meet demand that was becoming global. Carrier Corporation became a subsidiary of United Technologies in nineteen eighty and was spun off again as an independent public company in twenty twenty.

The Syracuse connection is memorialized at Syracuse University, where the Willis H. Carrier Total Indoor Environmental Quality Lab carries his name. But the real memorial is every cool room in a Georgia summer and every hotel in Phoenix in August and every server farm humming along at sixty-eight degrees in an era of escalating heat.