Hi all. I live in VT and it’s been in the single digits at night. I have a 4x6 insulated coop with venting around the entire top perimeter that are 4” high. I closed all the vents except 1/2 of a 6’ side for the winter. I also have a Sweeter Heater and a Cozy Coop. The wireless thermometer in the coop shows it stays about 10 degrees warmer inside than out and of course quite warm right next to the heaters. The humidity in the coop is around 40. So, I’m traveling for work and my husband sent me a pic this morning of black on my roosters comb. I immediately suspected frostbite and told him to apply lukewarm water on a towel until it warmed up. Well, when he got home today it appears to have spread to other parts of the comb, but it hasn’t been cold enough to be new frostbite. Also, at night he sleeps directly next to the Cozy Coop so I’m super surprised his comb has gotten cold enough for it to freeze. Could this be anything else besides frostbite? Any ideas why he might be getting frostbite or what I could do differently? I do not have any water inside my coop and use the deep litter method. The photo of him on the ramp is from this morning and the photo with him by the girls is from this afternoon.