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A comment on These states are basically begging you to get a heat pump. Parent comment
(And maybe a rocket stove combined with a heat storage hypocaust.)
https://solar.lowtechmagazine.com/2017/03/heat-storage-hypoc...
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(And maybe a rocket stove combined with a heat storage hypocaust.)
https://solar.lowtechmagazine.com/2017/03/heat-storage-hypoc...