Do you have a Rooster? because I noticed that a couple of his favorite hens were like that with the comb thing, turns out it was a bruise from where the Roo was hanging on to there heads with his beak while mating. Is your hen with the discolored comb acting funny (listless, tired, fluffed up, off her feed at all), because if she is acting sick at all it could be a respitory illiness (lack of oxigen) if she is I would get her on Medicine right away, I used corid v on my girls and it worked fast. Oh it could also be caused from fighting too, I noticed that when my roos fight they had bruised combs from grabbing each other by the combs. Hope your bird will fine, best of luck with her. Sandy
As far as preparing for the cold, I don't do too much of anything outside of covering the windows to keep out the cold breezes, I live in Illinois and it does get pretty cold here, but I have never set up extra heat for them or anything just try to cut down on the blasts of cold air and everyone has faired really well so far, my smallest chicken in the coop is Blossom a white leghorn (3/4 yrs old) and have had her since my first set of chicks ever and she does really well in the wintertime without extra heat too.
I had a strickly outside dog for 20 years, a pitbull named chance that I loved dearly, Everytime It got below freezing outside I would try and bring him in and he was miserable panting it was almost a punishment to bring him in, don't get me wrong he had a very nice large windproof dog house to go in, stuffed with straw, so he was warm in comparison to being outside with no shelter, Anyway point being that Animals get acclimated to the weather gradually, so it doesn't bother them like you would think, yes they get cold but they cope really well as long as it isn't a sudden change . Like say if the chickens were raised with a extra heat sorce and the electricy went out and it suddenly went from 50% to say 10% below zero theres not a doubt in my mind that I would lose some girls. I had a real problem with that issue the first year I was so worried about them dying of the cold and though I didn't lose any chickens there were a couple of cases of frostbite with the hens and Roosters with the very large combs, but I have learned that putting vaseline on the combs and wattles helps alot but more than anything covering the windows to keep out the cold wind helps most, I have ventitalation all across the top of the coop plus there pop whole is open all day for them to come and go at will, but that is closed at night mostly because of preditors more than the cold issue.
I hope i didn't upset anyone with my chance being a strickly outside dog, he was well loved and well cared for and lived til he was 20 yrs old a very very long life for a pitbull. And even the vet was suprised when he came in for his checkups and shots, she just couldn't believe he lived so long, we all cried when he did pass away.
Anyway I wasn't trying to get into all of that because now I'm in tears but like I said
I would rather them cope with the cold them stress them with temp. changes like that. Again best of luck with what ever you choose. Sandy
