I chose not to heat my coop this winter to try to not mess with nature. I also was worried about creating a warm, moist environment that would encourage frostbite. However, I am noticing a touch of frostbite on my single comb roos. All the pea combs and girls are fine. So I am wondering if I should rethink the heating plan. Currently we have 3 250 watt lamps going for a brooder in the house and a youngsters pen in the barn. My dh is going to be unpleased with the electric bill. We are also running 3 base heaters for the waterers outside. What do folks spend for a heating their coop. We have will have 35 -40 chickens in a 10 x16 older coop that is not esp tight. This is my first winter with adult birds outside and Maine has been especially cold recently, like 0 or less with minus 20-30 windchills. Thanks for your thought.