What is your set up like ?I don't put plastic on our cop or run though, and we get subzero temps. Never seemed to bother the chickens, remember wild turkeys and grouse live outside in it. Just got to check for eggs more often, otherwise they freeze and crack. They are probably still good but we always fed those ones to the dogs.
This it when it was first set up ..we didnt have the roosts up yet ..this was the temporary arrangement
My coop is my run ...they have roosting area on the right now & running area on the left .
these are wood slats nailed in a row on the back of the coop with a space between them . the whole setup has a real roof over it even the baby coop
With the back like this & the front wire fencing . the snow will blow right in both sides if I dont put plastic up .
My hubby & i designed it this way for air flow when it is hot out ..
I like this design because we can have more chickens if we want we just add more roosts .
They free range for part of the day anyway ...if they have to stay in they have room to move around .