As long as moisture does not condense on them, you don't have to do anything to their combs.
If you have inadequate ventilation, moisture will condense on everthing inside the coop..... and their combs will be the first thing to get frostbite. Exposed toes will be next ......
If you have inadequate ventilation, moisture will condense on everthing inside the coop..... and their combs will be the first thing to get frostbite. Exposed toes will be next ......