Thank you all very much. This information really helps the new people like myself. I have been going out today every few hours to feel my chicks feet to make sure they are warm. I've put them all inside early today. The coop in running 30 degrees, but under the lights I have, it is running 50 degrees. They are pretty much hugging together also. I also keep their water by the light so it does not freeze. I hope everyone stays warm, it is COLD in St. Louis!