It is likely your do have a humidity problem, which is common when the goal, although well intended, is the misguided attempt to keep them "warm" instead of giving them complete fresh air and not worrying about the temperatures. Chickens' have down and feathers for a reason. They sleep on the bare feet and cuddle with one another. They have no issues until about -30 below zero. Until that point, they are fine. They'd be fine in an open air coop, as long as they can escape a brisk wind. Wind isn't good, but wide open, fresh air is great. Dry is the key. Dampness breeds respiratory issues and discomfort.
The best coop designs are those which allow for full ventilation. Lots and lots of open eaves, roof vents, etc to allow the air inside the coop to be a fresh air haven.
The best coop designs are those which allow for full ventilation. Lots and lots of open eaves, roof vents, etc to allow the air inside the coop to be a fresh air haven.
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