I have a 4x4 Lowes my Little Playhouse for five hens. Some of you may remember these early in the year. Well, I have no heat, lights or anything. The coop is watertight, but the pine shavings are damp. When it was -25, the shavings were froze up pretty good. I have about six inches in there, trying to do the deep litter method. The coop does not have a bad ammonia smell, or a rotten wet smell. I did dig down to the floor and it was damp. All the birds seem fine, they eat well and talk a lot when I am out there. One does have the squirts though. I might do a 100% change this weekend to see what happens. Any thoughts?