So I am approaching my first winter with chickens (Eastern PA, USA) and I was getting everything ready in my coop and run last weekend and I have a question about ventilation. I purchased this prefabricated coop from Tractor Supply I modified it so that my chickens have a protected run while they are not free ranging so I modified the end to attach to a run.I am going to put plywood on the 3 sides underneath the roost/nesting area so the brutal winds at my house don't sap too much heat from the deep litter inside. However I need to cut in ventilation. The wall on the left hand side of the above picture has an egg door with a small slide open vent. I was going to close that because it faces the direction where I get most of the wind at my house. So I was going to cut a small (maybe 1.5 inch diameter) hole above their entrance door to allow moisture to escape but it will be in the wind protected area so wind doesnt whip through at night. Is that a big enough hole? Should I make a bigger one? Should I buy a small slotted air duct to make it less of a wide open hole? Any specific vents people have used to modify their coops? Thanks for any help!