On this episode of Our American Stories, before air conditioning, summer shaped how people worked, where they lived, and which cities could survive in the heat. That all began to change in 1902, when Willis Carrier designed a machine to solve humidity problems in a printing plant. His invention transformed the air around us and reshaped modern life forever.

Jesse Edwards, a frequent Our American Stories contributor, shares the story of how this once-overlooked breakthrough became one of the most important inventions in American history.

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