DH thought of foam board on the inside, but it's already so small. Made from half inch ply, so we covered it in plastic, and we'll caulk as soon as it warms up a bit but the whole thing is so drafty. Hinges were placed on the inside of the main doors so there's a bit gap there, drafts everywhere else. Is there anything else you can think of to get them thru a PA winter? We weren't too keen on a light but we'll run a line out there if we have to. Sorry about the pix, only one I had handy . many thanks!