I have a cold storage room underneath my front porch. It is poured out of concrete. It is around 20 long wide by 5 feet Wide. We don't use it at all for cold storage, but want to use it for regular storage year round. Obviously it is very cold in there during the winter. How do I Insulate a cold storage room to make it useful at room temperature ? Should I frame the whole thing and then use R-12 insulation or something else ? Should I just spray foam everything ? Should I use Styrofoam ?
Any ideas would help.