Personally, I'd not wrap the coop with plastic. IMO it needs to breathe. Put in extra bedding. Perhaps bank around coop with hay or bags of leaves if it's raised off ground. I also run ext. cord to coop. Have weather proof attachment at house, and at coop. Box mounted under eave where it is wired through the back (which is inside the coop with a 6 outlet surge protector box.) So, I can hook up heated dog bowl for water, do heat lamp if birds become hypothermic, and give them a light to boost egg laying. I don't start the light till late oct or Nov, about the same time I start the heated dog bowl. I put a gallon jug in the middle so it holds more water, and keeps them from wading through it. (when I go out to check on the birds and collect eggs, I simply pour more water from jug into the moat to keep the moat topped off.) Helps to keep wattles out of water also. You can pick up corrugated plastic tubing at any hdw. store to put around elect. cord to help prevent chickens from pecking, and mice from chewing.