I know this has been discussed elsewhere, but I didn't find exactly the answer to these questions, so I will post them, and hope either for good advice, or to be pointed to where the answers already are... I live in Missouri, where it will be below freezing a fair amount, but probably rarely as cold as single digits F. I have 4 hens (buff orpington, barred rock, partridge plymouth rock and New Hampshire Red) in a 6 x 10 uninsulated coop. It has vents below the eves on the North and South sides. The hens ignore their roost, and roost instead on a shelf way up in the northeast corner of the coop, right in front of the vent--but on that side, there is some shelter from the wind by the overhang of the sloping roof. There is a big window on the south side which does warm things up on sunny days. I am thinking of using a deep litter method for the winter since I have read that that keeps things warmer. Does it sound like my girls will do okay without supplemental heat? Should I remove the shelf and MAKE them use the roost, away from the vent? Should I cover the vent. I have read that they need plenty of fresh air, even when it's cold. Maybe I could block the north side vent, and keep the south one open. Also, I had pretty much planned to let them into their run every day. Is that okay, or do they need to be kept in at a certain temperature?