So it hit -5 last night with my seramas in an 8x8 coop that is not insulated, although it has both plywood and metal siding, with a single heat lamp hanging up high and a large vent in the ceiling are still alive. Not even some frostbite and only a little shivering last night then they ate lots of food this morning and acted like normal. This solves the question I had of whether seramas can actually survive cold weather. No one gave me a straight answer and several said only down to 20s F. Most of them hatched from eggs shipped from texas so it's not like I got a strain bred up here and then I have a few from 2 other sources from entirely different parts of the US. They just spent a month on the screened porch with plastic up and then a month in the coop before our really cold weather hit. Actually they appear to be doing better than my japanese bantams. Seramas can handle cold if acclimated to it.