I'd love to figure out how to do this in such a way that some or all of the warmth for them could come from waste-heat sources. Seems like such a waste to build

I'd love to figure out how to do this in such a way that some or all of the warmth for them could come from waste-heat sources. Seems like such a waste to build a dome for growing local food and then have to heat it through the night with conventional fuels.