Your coop is awesome!!!!!!!! very sleek and stylish.
patandchickens gave me some great tips as have so many others. Believe it or not, the cold does not seem to bother them!! They have lots of thick feathers which keep them toasty warm. We just need to watch out for the humidity/moisture levels. I bought a thermometer which is basically so I can watch their behavior at the lowering temps. Check out my BYC page for pics of my coop. I feel pretty good that mine is on the south side of my garage so it will be shielded from north wind. When the leaves fall from the trees, it will receive sun from the east and west, and there is a small window on the south side. We bought a heated water base at Bomgaars that we sit our 2 gallon galvanized waterer on top of. That should add a tiny bit of warmth also.
Have fun fellow Nebraskan!! What town???