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Does anyone know of similar technology for the inverse? Saving cold from the winter for the summer? With hotter summers and more extreme temperature swings to be expected, it might cut costs on running the AC's

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For thousands of years ice and snow have been gathered in winter and stored for various summer usages in purpose-built structures, ideally underground: https://en.wikipedia.org/wiki/Ice_house_(building)

Research thermal mass storage. Basically fill your house with heavy stuff and then insulate the outside walls well.

It works for both winter heating and summer cooling

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