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A comment on Ask HN: What interesting problems are you working on?. Parent comment

Re:Ask HN: What interesting problems are you working on? by auiya on Wednesday January 29, 2020 @01:07PM (#22183785)
Funny to think the Romans were doing this thousands of years ago (and probably civilizations before them as well), and here we are just now coming around again to the idea of heating/cooling via cistern storage.
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Re:Ask HN: What interesting problems are you working on? by raxxorrax on Thursday January 30, 2020 @04:58AM (#22190210)
True, but current techniques for thermal isolation could really make it quite efficient. The optimal cistern would be a giant ball of water under your house.

I don't have his spreadsheet anymore, but it seemed really solid.

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