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Re:How air-conditioning created the modern city by mirimir on Wednesday August 15, 2018 @12:15AM (#17763727)
For underground storage, it's basically just brute force. Or rather, a riff on geothermal.

For building-scale storage, there are two factors. One is obviously very good insulation. Both for the building, and for the heat storage. The other is storing latent heat in a medium that changes phase, usually liquid to solid.

And yes, that's the idea. In summer, store heat from solar collectors, and from air conditioning. In winter, use that heat, plus PV electricity.

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