this post was submitted on 21 Sep 2026
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Why does no one seem to use peltier elements to heat small greenhouses? (feddit.org)
submitted 1 week ago* (last edited 1 week ago) by viertesauge@feddit.org to c/gardening@lemmy.world
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Genuine question. When I look up options for heating greenhouses its either propane, kerosene or electricity. So if you dont want to use fossil energy for any reason, why not use peltier elements which would boil down to resistive heating and moving heat from the outside to the inside?

Is it because they dont last in the weather? Or because they require a DC source? (couldnt you simply move the PSU inside the greenhouse and use any conversion losses as additional heating?) Or maybe its because you would have to possibly cut a hole in your greenhouse walls so that the peltiers cold side is actually on the outside?

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[–] evasive_chimpanzee@lemmy.world 2 points 1 week ago

Peltier plates are one of those things that always seem so cool and useful until you do the math.

I absolutely hate those tiny fridges that everyone assumes must use a tiny amount of electricity when in reality, they use more than a full size chest freezer.

Thermoelectric generators can be nice, though, in the right application. I like how they are used in the biolite stoves to drive a fan that improves combustion. It's a nice feedback loop.