The Unexpected History of the Air Conditioner | At the Smithsonian | Smithsonian

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The technology (above: c. 1947 advertisement for Carrier) that was initially envisioned as a tool to enhance industrial productivity is now a near necessity for American homes and transportation. ( Fotosearch / Stringer, Getty Images)

Source: The Unexpected History of the Air Conditioner | At the Smithsonian | Smithsonian