I've had my key west chickens for going on 8 years. I have never lost one to the cold. We don't have alot of freezing weather or snow here. But, we do get the occasional cold snap where it can get into the teens at night and barely above freezing during the day. This can last several days. I recently got some seramas. They are not tiny but still pretty small. My chickens are in chain link dog kennels, 10x10x6. They have a 2x4 and tin roof. The back side is protected by a shed and during the winter, both sides are tarped, leaving only the front exposed. I keep no litter on the ground, they sleep on perches. My serama pairs are in big wire dog crates, inside one of these kennels.They seem to be doing fine but we haven't had a wicked cold front yet. My question is if I got a big brooder lamp from TSC and hung it over the top of the wire crates, would they still get the heat or would it all rise towards the top of the pen? I doubt if it would keep it toasty but maybe above freezing.