this post was submitted on 15 Jan 2025
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Look into geothermal heat pumps. During the summer they pump heat from your house underground, and during the winter they pump it back in.
But the energy doesn't really stay there. The thermal mass and temperature of the ground just means that you can always efficiently take heat from it or effectively dump heat into it. Always predictably the same efficiency.
If the heat was actually stored, the start of summer and winner the pump would be super efficient, but by the end it'd be inefficient working hard to move the heat. So it seems kinda wasteful that the energy isn't being stored, but it's actually kinda better that it isn't.