Would love some advice about how to help my cold chickens...we built a fairly small coop for our 6 cold-hardy chickens and felt that the consensus seemed to be that it's best not to heat a coop in the winter in case power goes out (very likely in our NC mountain town). Our coop doesn't have any windows other than one that lets light in, but it does have a tin roof that is ridged that provides lots of natural cracks at the top. We have a device that measures humidity, and while it did get very, very cold (down to 12 degrees inside the coop), the humidity doesn't appear to be above 58%. The bottom line is that after 3 days of snow and sub-freezing temps, all 6 now have mild frostbite on their combs. Winter has just begun here, so I wanted to ask...what are we doing wrong? How can we better protect our chickens from this happening again? Thanks in advance for any help you can offer!