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by tutorialmanager 1249 days ago
Get buckets of water from your pool (or lake or well) and put them in the fridge till they cool down. Then dump the water outside and get a new bucketful). To save effort you could run 2 hoses with a small pump. You are now heating your house with a ground source heat pump.

I really enjoyed reading The Homemade Heatpump Manifesto on Ecorenovator. https://ecorenovator.org/forum/showthread.php?t=484