I'd like to fashion a small, 4'x4'x4' outdoor enclosure. It must have the environment of the house- climate controlled, etc. Since the enclosure is a small one, I'd like to design it to keep heating/ cooling costs to a minimum and maybe even eliminate most of the cost through proper moisture sealing/ insulation. Although I could probably build the wooden enclosure I would need, I would really like to try using a vinyl shed. What would I have to do to make its environment more like the indoor home climate?
Thanks, RJ