We have four backyard chickens and two backyard ducks, all girls. For spring/summer/fall, we have them in a quite open coop arrangement, and they free-range in the fenced yard during the day. I'm anticipating winter, however: we can expect the first snows as early as the last bit of September (just had our last snow two weeks ago), and January/February temps can hit -20 easily, warming up to near-zero if the day is sunny. Any suggestions on how to make sure our girls are comfortable through the winter? We'd love it if they'd continue to lay, and are planning to provide augmented light to hit about 12 hours a day (off at night).