I have a large unfinished old celler type basement. I was wondering if i could turn part of it into a greenhouse type deal to grow veggies and stuff part of the year and for seed starting? I also would have bins of red worms as well. I think i could firguge out the lights but it gets so cold down there that our pipes freeze in the winter. We are working on that problem. The walls are brick and the floor is cement. I would have to do this as cheap as possible. I have a ton of scrap wood, fish tanks, shelves already. How warm does something like this have to be? Any ideas? I'm worried about fire hazards if i use a space heater or anything like that.