Hi everyone, We don't have horrible winters here in the high desert. Lows may get into the 20s but usually stay in the 30s, we may get a day or two of light snow. I have a small coop (4 x 4 x 4) which houses 4 hens and we are approaching our first winter. There are small holes at the top of the coop for ventilation and an 18" square window slightly above roost height that I have now blocked off with Styrofoam, which they can't get to. I don't think that's enough ventilation so was wondering if leaving the floor level door to the run open would be ok draft-wise. I clean their coop every day so there is only a night's worth of poop to give off moisture and ammonia. I also have a layer of sweet PDZ down, mixed with the 3 inches of wood shavings that are the bedding. The one time it got cold last week, I closed the door to the run and when I opened it up in the morning, it was pretty stinky in there. What do you think? Thanks for all your sage advice. You got me through a wicked hot summer, I'm hoping my girls won't suffer the winter because of me being such a newbie.