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Air Conditioner

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The most commonly installed are air-source heat pumps, which resemble air conditioner units that sit outside your house. During winter, a liquid refrigerant in a copper coil extracts heat from the atmosphere as warm air naturally moves toward the cold. The heat transforms the refrigerant into a cold gas and a compressor then pressurizes the gas, raising its temperature and heating the air inside the house. The reverse happens in hot months, when heat inside the house is absorbed and transferred outside. That's increasingly useful in temperate areas of the U.S., where people typically don't have air conditioners but are being hit with climate-change-fueled heat waves.

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Just the other day at a “Breakfast with Friends” in the Great Hall at St. Apollinaris Church in north Napa, Jeanette and I were seated next to…

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