In a few nights, it will be going down to -14 degrees F. Should I put in a heat lamp? I have 7 chickens in an 8x10 non-insulated coop, but one chicken always sits by herself on a different roost while the others cuddle together and I feel bad for her. Will the heat lamp make the humidity worse? I don't want them to get frostbite and I don't want a coop fire, but will they be alright without a heater? Also, for those chickens with big combs, what is the minimum temp to put Vaseline on them? is it anywhere below freezing, or only when it gets really cold? Thank you!