I live in Western MA, and it has been very cold this winter, getting down into the single digits most nights. I got a new coop this year for my 7 chickens that is a converted shed, 10'x12' in size, with the idea that I would get a few more hens this spring. I have large screened gable vents, so feel like they should have enough ventilation. I have a heated water bowl so they always have unfrozen water. I have also been giving them extra scratch and a small amount of extra fat. On the coldest nights, I bag balm everyone's combs and wattles. They have a dry, covered run, although they will stay inside on colder days, and are closed in the coop at night. The problem is that they have all gotten frostbite on their combs,and the rooster on his wattles, something I haven't experienced in previous winters. The frostbite isn't extreme, but I feel like I must be doing something wrong. I have read lots of the posts here about winterizing the coop and whether or not to use heat lamps. I would rather not use heat lamps if possible because I am not comfortable with the fire risk they pose. In addition, I tend to lose my power often in storms, and I don't want my birds to become accustomed to the warmth with the risk that it will become suddenly unavailable. Is my coop too large for the number of chickens I have? Is there something else I haven't considered?