I am up here in Caribou, ME next to the Canadian border. We are supposed to get some cold temps tomorrow night, nearing -35 below zero (that is without windchill). I do not have an insulated coop, but it is very draft free and dry, and I do have the run covered in clear tarp. I really don't want to run a heat lamp, I don't have electricity in the coop, but could run an extension cord if I need to. There are 6 chickens to the coop, which is about 4x6, and 5 feet tall. Should I just let them cuddle or should I break down and put a heat lamp out in the coop tomorrow night? I have a 250 watt red light, but am so petrified of fires, as I have about 6 inches of shavings and hay on the coop floor. They have not had any heat at all since winter hit, and the coldest we've seen so far is about -25 below, which they all seemed to fair well through (although I'm sure they weren't too thrilled with the temps!!) I'm ready for summer!!