Radiant Floor Heat Greenhouse
I've been wanting to build a 30x60 greenhouse with radiant in floor heat. I want pex tubes in the plant beds so I'm not wasting heat. I've had a few different ideas
Pour concrete plant beds with pex in them to heat, but I'm worried about the cost and bulk/weight of the beds. These would be like the concrete feed bunkers for cattle.
Pour a insulated concrete floor with pex in it and put dirt on top of the concrete. My worries here are floor drains and expense of concrete?
Put pex directly in the dirt floor. This worries me because the pex is not protected, if I insulate the floor then I don't know how long it would last being directly in dirt. Without insulation then I would be heating a lot more soil mass than necessary.
The greenhouse would be poured like an earth contact home or walkout basement to help keep it warmer and then the top of the greenhouse roof would start about 1 foot above ground at the soffits.
Has anyone done something like this? Any tips or advice?