nostr:npub16rsfuhv9vvn39cmrdg9s9qcq20lfqp4u8w35f8svm30dny345d7qhc2zfj nostr:npub1uhyp2jpp5gwjqh7w52tlapdwssmycmxglw2dzavy3mas3sfr83rsv6y4d5 btw if you’re more interested in the thermal mass for a greenhouse than having warm feet, it might be a lot cheaper to just heat up some tanks of water (black and in the sun ideally) and call it good