jan 1, 1970 - Central Air Conditioning

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"Things changed again in the 1970s, when central air was invented. The early central air functioned much as it does today: Using a condenser, a fan, and coils, air makes its way through the unit, gets chilled, and gets dispersed throughout the house. These early central air conditioners used Freon as a refrigerant, a substance later revealed to be an environmental hazard."

https://www.kycomfort.com/history-of-residential-air-conditioning/

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