This will be my first winter with the chickens. I got an Eglu cube, which is pretty well insulated. The manufacturer says you don't need any supplemental heating, but they're in the UK. Here in northern Illinois, we usually get some nights that go well below zero, and have weeks where it doesn't get above freezing. I've been reading about using a ceramic heat emitter like they have for reptile cages. Anyone have any experience with those? I have four SLW girls, and they're supposed to be quite cold hardy. I plan on moving the coop to a sheltered area and covering the sides of the run with thick clear plastic to protect them from the wind.