If I could get some questions answered, it would be much appreciated. This is my first winter having chickens and very confused and frustrated. We have a small hen house, approx. 4 x 4 x 5. Because of its size I did not feel that insulation or heat was necessary. We live in northern Indiana, so I chose cold-hardy breeds, we house 5 hens and one rooster. Our chickens are out in run every day from dawn to dusk and can get inside their house anytime they want. The coop is well-ventilated, maybe a minor draft on one side. The door to the house is closed at night. The chickens all seemed fine, until a few weeks ago. my rooster, a favorolle, suffered bad frostbite. He points of comb are all back and the top half of his comb are purple. Doesn't affect him, he is acting normal and doing his stuff. But now I don't know if I need insulation, warm lights or what? I have a thick layer of straw in house. Just as I go to do something to make it warmer, (I have covered the space of draft with tarp) I get conflicting information. Can anyone tell me why, if I don't need insulation, did my rooster get frostbite? Is there anything I need to do for him now?