My main question pertains to heat. I plan on NOT heating our coop this winter (our first winter with the girls). Last year was historically cold and this summer and fall have also already been on the chilly side (Pennsylvania). I have a metal covered light fixture in the top of the coop (it's an 6x10 walk in coop with a 8x20 run, half of the run is covered). Has anyone used a nocturnal light bulb like they use for lizards and snakes? My main concern is when it drops below zero for a snap, which happened a lot last winter. I don't intend on running it other than that. I have 8 birds, Australorps, RIR's and Buff's, so I know I have some cold hardy birds. The coop is uninsulated and unfortunately on the north side of our garden shed. I know I'm convoluted in this post but hopefully someone understands what I'm saying Thanks!