I put foam insulation along the outside of the coop, it has a 1x1 opening that I am going to put a flap over, but there is a wall when they walk in they have to walk around to get to the inside. I am going to put a few ventilation holes in it so it doesn't get too humid. I have been giving them some scratch in the morning to peck at. I was thinking about putting the plastic up on the run, I may try it if I can get it to stay on.
It's a wooden dog house, there is a 1x1 opening and there's a wall that they ahve to walk around to go the the inside to block out wind. I am going to put a flap on it so they can go in and out still but have the protection.
You can purchase inexpensive tarps at Home Depot with grommets along the edges. These can be used to wrap your run and will easily attach with zip ties from a dollar store. The tarps come in various sizes and are found in the paint department. Good luck!