Hello, First winter with my 7 chicken girls. I live in Clearwater Florida so it is pretty mild here. My chicken coop has a long roost bar at about 5' up and protection on 3 sides from wind and rain. They do not have a fully enclosed area, we use hanging nesting boxes on the side wall but of course they do not sleep in there. Do they need more protection? If we get a rare night below 50 degrees should I hang a tarp over the front to keep wind out? Thank you!