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The first A/C unit was developed in 1848 by Dr. John Gorrie. He believed that cooling was the key to avoiding diseases like malaria and making patients more comfortable. His system for cooling hospital rooms required ice to be shipped to Florida from frozen lakes and streams in the northern United States.
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It was designed to control humidity more than temperature. Cold air can hold less moisture than warm; Carrier’s invention helped keep humidity levels low for the Sackett & Wilhelm's printing plant, where moisture was wreaking havoc on the paper and ink.
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In 1931, H.H. Schultz and J.Q. Sherman invented the first room air conditioner; it sat on a window ledge, similar to portable units today.
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The 1940 Packard was the first car to offer factory-installed air-conditioning.
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The invention of the rotary compressors reduced the size of the air conditioners along with increasing its efficiency.
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the nest thermostat made it easy to connect home HVAC systems to the Internet. It’s success leads to a $3.2 billion acquisition by Google just a few years later.