I know there are tons of info here about the % of humidity and such for your coop and what a high reading is. My question is: I have a 12x10 A frame coop insulated with the deep litter method currently at about 5 inches deep, I have 3 vents on the front of the coop and 4 in the back above the roost. During the day the humidity is between 35-45%, at night it will jump to about the low to mid 60's. I have noticed a few of the girls have the very tips of their combs turned black, not all of them but a few. Is my humidity level too high, or could they be getting frostbite when they drink and expose their combs to the water and then going outside in the cold air? Any thoughts or idea's would be great.