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I was thinking about doing something similar on a smaller scale to dump the heat concentrated by an air conditioning system. I was thinking that it might be useful for heating in the winter.

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I’m quite sure I’ve read about people doing this in Scandinavia. Pumping warm water into an insulated tank in the ground for use in winter.

Can’t member where I read about it :(

Also Okotoks Alberta[0]; Drake Landing Solar Community

[0] https://www.dlsc.ca/

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