I've read all about the pros and cons of heating or not heating the coop and I feel better if I know that my birds are not shivering. I have a large coop with 9 hens and 1 roo and I have put a 250 infared heater in there that provides just enough heat to keep them warm but not to keep their water from freezing, as I found out this morning. I do have an electric water fount, but used the extension cord for the light thinking that it would be warm enough to keep the water from freezing. I will buy another cord for the waterer. I have a 2nd coop which is only 4 x 4ish, about the size of a large doghouse. This is the one I am having trouble figuring out how to heat. It only has 2 birds, a roo and a hen. I can rig a heat lamp in there but know that a 250 watt is too much for such a small area. I can buy other infared lights in various wattages in the reptile section of the pet store. Does anybody have suggestions on what wattage would be best for such a small area? I think they come in 50, 75, 100 and 150 watts. I'm hoping that I can heat this small coop and keep the water from freezing without purchasing another electric waterer. Does anyone heat a small coop that could give me some insight? Thanks.