Sandi, we did the exact same thing a couple of winters ago, minus the door. We just had a plastic flap. We're in GA. And we put it on the south side of the house (back). but I actually had spider plants in there all winter, no heat and they survived. Big pots with gerbers and they blossomed all winter. I was lucky though and DH agreed we really needed a real GH. I think he was getting tired of putting up and taking down!
