What climate do you have? Are they non-cold hardy breeds? Otherwise I don't think you should give them that much heat at that temperature. We have 10F-30F everyday here during winter. We had -15F one day, we didn't give them any heat, they were happy and healthy the whole time. Chickens don't really need heat until -25F, but then again it depends on breeds.We only use our heat lamp if it's below 10 degrees, never at 50* or 60*. Our adult chickens love that kind of weather![]()