So we are in the middle of designing our coop for 4-6 bantams (not here yet) and we live in Minnesota where our winters get real nasty cold. We get many days well below zero so we are going to insulate the coop very good but do you think we will need to run some kind of heat element too? Will a regular lightbulb work or is a heat lamp safe to run all the time? I am also worried about a fire hazard. What have you guys used for heat? The coop will be smaller about 5x6 and about 5 feet high.