I have covered the mesh front with an outdoor type fabric..blocks wind, but without holding in humidity. My husband added two very small vents at the top of the coop..Our coop looks like a small airplane hanger..The vent were added because on some days..quite cold ones, I noticed some condensation on the walls of the coop. So the fabric is definitely doing something. I let my chickens out every day because on the day of our first snowstorm back in Dec., one started pulling feathers and it just continues..I've tried everything! REALLY!!..Now I'm starting to question the coop design. We designed "by the books" but it is small. They are heavy breeds..seven of them , all different. Although I light the woodstove on very cold days, my birds have gotten frostbitten. I am heartbroken..I tried the vaseline...I hear more bad things happening with a heated coop than not..but how common is it for chickens to get frostbitten in the first winter, and then not to get frostbitten in subsequent winters? Everyone seems ok, they are laying..except for the Americauna..and the frostbite healed very well..Is this why they are pecking each other? They seem to have gotten the frostbite while just poking around the yard ..these are not birds that "look" cold ..they have a compost pile to scratch around in and shelter is always available to them..this winter has been so stressful in worrying about them...by the way..I started using peat moss as a ground cover in our run...and the chickens LOVE IT!!! -I do get funny looks at Agway when I ask for Peat Moss in Feb...lol....