Hi all, I am a new chicken keeper of 7 hens a few weeks ago. I live in Minnesota and the weather as gotten cold/snowy and windy pretty quick. I moved into a new house that has a log building on the property. It is obvious that the previous owners had chickens in it at some point. So I decided to use it for our chickens as well. The log building is about 12x12 and 6 feet tall with a upstairs that has a separate entrance to it. I knew that the building may be cold because the chickens had a lot of space in it so I put some straw bails along one wall to insulate it a bit. The coldest it has gotten in there is 14 degrees F when it was -11 outside with windchill and a 10-15mph wind. Some of the chickens combs seem to be a bit dull and grey in spots. I believe they may have some frost bite but I am not sure why or what to do about it. It does not seem moist in the building as far as I can tell. There is some air exchange between the the ceiling/floor of the upstairs which I was thinking would be good enough ventilation. I cannot really add more ventilation as the windows do not open and I cannot alter the log building easily. I may be able to pull up some floor boards to let more air escape. But would I want to do this since it's already chilly in the coop? How do I know if the frost bite is from just being cold and restricting blood or if it is from moisture. Again, it really does not seem moist in there. I also know that the winter will be long and there will be colder nights. I do not have a heater or heat lamp in there now but I do have a 100w bulb that comes on in the morning for a bit and afternoon a bit. Any pointers on how to tell if its too moist in the coop or if there is enough ventilation or what to watch for to make sure the chickens are ok in the cold weather would be great. oh yeah, I have put petroleum jelly on the combs and it seems like this happened in the next day or two after. Any insight would be appreciated.