We had an unsually cold winter for Alabama and I had to cover my eve vents with canvas cloth to keep the chickens warmer. It went down to around 15F which is very cold for us - my chickens are not acclaimated to those temperatures. Well having done what I could to close off some of the vents I am now going to make some changes to my coop by adding at nice roof vent. I would like to see what changes others are making so we can all learn from each other. Here's the pictures showing the roof vent I am going to add.