I didn't know about the straw being a good source of insulation. my floor is sand. I covered all with windows with thick plastic. the high here in Alabama is supposed to be 17 I think. my flock free ranges most of the time. is it ok to let them out in temps that cold? plus our roads are supposed to be icy tomorrow so I may not be able to get the straw. what else could I do? my coop is prob 6ft wide and 5ft tall. also I have one of my hens that doesn't sleep beside anyone because she is low on pecking order she chooses to sleep alone. I don't blame her. is it ok if one sleeps by itself in the cold?