Since the 1960s, most newly built homes have included central air conditioning systems. Homes that have been remodeled since then have often been retrofitted with the ducts and equipment needed for air conditioning. While it’s common today, air conditioning was an incredible feat 100 years ago. Here’s what you need to know about the key players in the invention of central air conditioning systems for homes. Willis Carrier Willis Carrier was an American engineer. He worked for an engineering firm, and one of his first assignments was to help a printing company that had a problem with humidity. The humidity
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