this post was submitted on 23 Jun 2026
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i believe a few meters down it's a constant 10-15 °C, they do use it in "ground heat exchangers", cool in the summer, warmer in the winter
A few meters down is a lot to dig with a spade compared to 50cm which is still quite a bit of digging really.
I do wonder what kind of temperature the water in a pond would be and if I could use that to dump heat into from my house.