I live in Northern Michigan. We have had snow since October. Over 55 inches so far. The daily humidity is between 87 and 98 percent. It has dropped down to 2 degrees and will get to 20/30 below by Jan. My coop was a bunkhouse formally and we turned it into a coop last spring when we decided on Chickens. It is 13x13, insulated with 2 windows. I have 8 chickens/2 guineas. I have holes drilled at the top on the South and North sides for ventilation. There is an attached 8x13 run that we covered in clear vinyl shower curtains for the winter. I put a humidity meter in the coop and it reads, 95% most days. So I bought an exhaust fan and installed it on the north peak front hoping it would help remove the moisture. It stated it would work up to 150 sq feet. It doesn't. Hubby states, if its 95% humid outside, it will be 95% inside, no way to get around it. My Isa Brown already has some frostbite on her comb. I decided to put in a 250 watt red heat bulb secured with chains that is directed towards their roost. It helps, (temps stayed 6 to 7 degrees warmer inside) but I cant sleep due to worry of fire when its on. Today I am considering buying a flat panel heater to keep the coop at 15 degrees, but I still have the moisture issue regardless and heat added will start to mold litter, etc. I am so frustrated and out of ideas. Can anyone offer any advice as I am ready to give up! I read all the ventilation threads/advice but when the outside humidity is this high everyday...what do you do? A dehumidifier will only work in temps over 50 degrees, so that's out. My deep litter of 12 inches of straw is damp. Its new straw as of 3 weeks ago. Help!! Thanks, Renee