I know that you guys in the REALLY cold climate zones smile about us Southerners worrying about temps in the 10's or 20's, but I have decided, that I'll feel better if I heat my coop at night. At first I went with a heating lamp with white light, but the chickens had a fit. Then, I switched it to a red bulb, but could tell that they did not sleep well and were real uneasy (I checked on them several times before I went to bed, and they were not asleep). Then, someone on here mentioned a black light, but I went EVERYWHERE today in search of one, and could not find one. So, I found a Heat Emitter at Petsmart, which is usually used for reptile terrariums. There's no light, only heat, and hopefully this will do the trick (it screws into a normal clamp lamp). It was $42, but if it works, and keeps the temps in my coop at least around 40, I'll be happy. Has anyone ever used one of these?