Any ideas? My pop door faces north. We have had highs in the lower 40's recently with some strong north winds. Enough that the shavings are being blown around in coop. This will be my first winter with chickens and was wondering if anyone had used a tarp or something else over pop door that would still allow chickens to pass thru? Coop is not insulated, chickens are doing fine so far with temps in the coop staying between 30-45deg. F. My door to the run faces north too, so I can not cover north side of run. Thanks for any input.