It’s 26 F in Michigan, hoping to see the sun sometime in May! All the chickens are cold-hearty (I don’t have that gene!) - been looking at rural properties in Tennessee and Florida!!!
Chickens don't care they don't think they even need heat, their roosts are all up in the rafters of the their shed though and that helps. The coop stays about 10° warmer than the outside air until I open it up and let them out. I keep two water buckets and rotate them and have plenty of chicken cakes set aside for snow days.