we have a small a-frame coop with a fenced in pen area below and our chickens have done the free range in our fully fenced in back yard since we got them in May. the coop part is about 3 ft x 6 ft for 3 girls and the pen widens out to about 4 ft x 6 ft. For the winter here in Maine, we plan to put in a light that we think would provide heat and light for about 12 hours each day in the coop (6 a.m. to 6 p.m.). The coop has one very small window and a small amount of light comes in from the ramp to the pen. Basically it is very dark in the coop if the open hatch top needs to be closed in the winter time. We use pine shavings and don't plan to insulate it, although we will put some type of wind break around the pen and hang something around the coop to cut the wind chill. Any ideas for that? Is a 75 watt bulb too much for that space or would a 60 watt do? It is starting to get into the 40's at night now and temps here on the coast usually drop to about 10-15 in the winter. Wind chill can make it feel way colder. At what temp should we start the light. And what about the night time when it may be colder and we don't plan to have the light on. any ideas? I'm getting worried about them freezing out in the dark and cold come winter.