
I have built a 10'x10' greenhouse from scrap wood ,plastic ,old storm windows ,and corrugated barn tin! T he tin is around the bottom perimeter, from the ground ,up to around 30" or so. Its attached to the outside. could I paint it black, inside and out,attach more on the inside(painted black also) ,leaving an air space vented at the top of the tin,to generate heat to keep plants from freezing on really cold days? could i fill it with some medium to collect the solar heat and release it slowly at night