Cole, thinking outside the box, but in similarity might help?
The coldest places inside a home (Especially an older home) in the winter is under lower cabinets, under the sofa, under beds, etc. Some have simple fixes like under a sofa/couch - you can roll up bed sheets to stuff under the edges to stop the cold draft. The kitchen and bathroom cabinets you open the doors so they can warm up to keep the waterline from freezing. On VERY cold nights, I don't just open the cabinet doors under the sinks, but I also put a fan near them blowing warm air in. Circulating air does a lot. It can cool things off when it's too hot as long as windows or doors are open - or an AC is on, but in cold temperatures, fans will circulate the heat above to the lower areas.
I can't see this being different in a green/hot house. Of course there would have to be heaters too.
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