Im curious as to why some people say you shouldnt provide any heat source for chickens because its bad for them, or that the temperature difference will make them sick. My dogs transition between 70 degrees and 10 degrees with no ill effects, as do my cats. They wear fur coats 24/7, and they seem to appreciate having a warm place to go (based on how much more time they choose to spend inside the house when it's really cold). And yes, I know they are mammals and my chickens are birds Im one of the minority who does try to maintain my girls coop above freezing. It typically stays between 34-40 degrees in there. The cost is my worry, just as spending money on my dogs and cats is. So far, their pop door has been opened for them every day, to give them the opportunity to go outside to their little porch area or into the run, which they usually take advantage of for short periods of time if theres no snow on the ground. We've been having lows in the single digits, highs maybe to the mid 20s. I clean soiled bedding and scrape their dropping boards daily, and the humidity stays well below 50%...19% at last check. I have seen no ill effects from them having a warmer, more comfortable area to hang out... So why/how is it supposedly bad for their health??? Here are my girls yesterday morning, after I cleared a patch of snow and threw down a bit of hay so they could reach their cabbage head...I think it was about 15 degrees.