Let me start by saying I have taken the time to read through the ample postings on cold weather chicken keeping, and already have a good grasp on the basics on keeping chickens in cold weather. This will be my first winter with chickens, and where I live the temps get to -30 several times during the winter. We can go weeks at a time when it never gets above 0. It's the real kind of cold. Our one saving grace is that there is virtually no humidity, it's a very dry cold. My chickens have a nice, dry, draft-free coop and run with good ventilation. I am using the Deep Litter Method for added warmth. The coop is in an unheated garage, and I had planned on minimal use of supplemental heating. The temperatures in the coop will drop to the outside temperature during the night. I have talked to fellow chicken keepers in the area, and I am sure my birds will be fine, other than just one thing: FROSTBITE. I only have one chicken with really large comb and waddles, a Welsummer rooster. I spoke with a woman yesterday who has been keeping chickens in my area for a very long time, and she said that he would almost certainly get frostbite on this comb. She said that it doesn't seem to bug them too much, and that the comb just freezes up, dies, and falls off. After this, they are fine I guess. Is there another way? I have heard that petroleum jelly can help, but what about at -30F? I am not against plugging in the heat lamp from their brooder (I have made considerations regarding the fire hazard). Would this be enough, or would it even make a difference?