You must realize' if you heat the coop your chickens are Lilly to get sick. From a warm coop to a cold out side makes for a bad combination. A good insulated coop and a nice covered run will keep them wonderfullyx all winter. I use carpeting on there roosts and I use 2 by 4 's so they have a nice roosting surface to sit on. All carpeted with very low pile there comfortable and can sit on there feet and there feet stay warm on the carpeting. My run has a covered roof, we completely cover the sides ( this year using heavy plastic stapled on) and a cut to fit plywood sheet over the door to keep wind and snow out. We used tarps last year but it was hard to keep snow off the top so we had a roof put on and it's going to be so much better.the plywood covering the doors is held in place by a long stretchy bungee cord. My chickens did wonderful with the snow and wind blocked. There coop was much warmer also. With a totally dry pen, and wind proof, there much more warmer . We used a dog kennel panels last year and used zip ties to tie on tarps, but this year we decided to add a roof and hard wire pen because we were forever trying to keep snow off the tarps so the roof would not cave in. I. Decided when spring came I was going to make it easier n my self and have a new pen built, and use clear plastic for more light. I can not tell you how much better it is for my girls to not have to be in the wind and snow. And have a roost covered in carpeting . They do very very well.
see any poop there jack?? well that roost has been carpeted for 5 months now, never scooped poop or cleaned it. I say its just fine ! this coop holds ten girls. I just choose to keep on top of the poop and am always scooping the poop board and cleaning litter. but my roosts, I have never had to touch yet. I have the same roost on the other side of my coop, carpeted to, been there for over a year, not a drop on it. no mites, no bugs no poop. 
