Heating, ventilation, and air conditioning (HVAC) systems are so commonly used in American commercial buildings, schools, data centers, homes, and other places that you probably don’t notice them unless the setting is too cold or the system breaks. You’ve probably never given much thought to the history of HVAC installations! Whether you notice HVAC systems or not, Americans spend vast sums on them. The Energy Information Administration reported in 2015 that 48 percent of energy consumption was related to heating and cooling costs! Though HVAC systems are everywhere, how much do you know about their history?
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