We have done all we can figure out to do to keep the humidity down in the coop. It has been resting around 70 to 80% for a couple of weeks now but that is because it is that outside too. We have ventilation holes in the coop but not sure it will matter if the humidity is high outside too. My husband put a temperature and humidity detector in the coop so I can monitor it. We have several chickens with black on their combs even with putting Vaseline on their combs almost daily. Not sure what else we can do. We could put a few more holes in the coop at the top to help with ventilation but not sure it will help until we get out humidity down outsdie. Typically Boise is a very dry climate but apparently when we get inversions (cold air trapped in the valley, if you don't know) the humidity stays high. Never realized this before as Southern ID tends to be more arid than humid. Any ideas? OH yeah, we don't have a safe way to get electricity out to the coop this year.