this post was submitted on 13 Jun 2023
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Home Made Renewable Energy Systems
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Agreed. I think it would be hard to retain heat across seasons (if that's what you mean), but it would be pretty easy to create something to work intra-day. I've seen examples using stone walls, but I think you could do something smarter and more responsive to actual inside temperature. Combine that with active ventillation and you've got a pretty neat setup at a low cost.