I am not new to chickens, I grew up with them in Pennsylvania, and have battle scars on my ankle from our territorial rooster. My issue is winterizing the coop for the winters in Montana. I am in the process of designing and building a coop, but the winters in Montana are complex. Two winters ago, the temperatures in January and February never got above -20 degrees in the day time for about 4 weeks. This year, two weeks ago it was -24 at my house, and now it 50 degrees, this weekend possible 60 degrees. the temperature here can vary from -25 at night , or lower to 60 degrees in the day, just a few days later. Any ideas on how to winterize for these extreme varied conditions for the new coop?