Ok, I'm new to raising hens. I have 4 hens, 2 Brahmas and 2 Golden Comets. My coop floor is 4x4, with 2 walls being 3 feet high, and the other two are 4 feet high at the peak. I was wondering if I should put in a heat lamp or not. If so, what size? should I just run it on really cold nights? The guy at the feed store recommended a 250W red bulb, but I think that might be a little too much. I live in the mountains of North Carolina, so it can get pretty cold here. Also, with my coop size, how many hens could it comfortably house?