Hey everyone, I live in New Hampshire, and it's starting to get pretty cold. It's the chickens' first winter, and I am considering a heat bulb for the frigid hours of the morning. What wattage is best? There are 17 chickens, but the coop has very little insulation. Thanks! Also, now that the chickens have reached their full size, a few have resorted to sleeping on the outside perch. They are all pretty weather-proof breeds, but should I build a third indoor roost? Sorry for all the questions, this is kind of my first time. Thank you!