For winter, the heated dog waterer is working well for the chickens & sits under my coop in the lower level with sides that are closed at night to keep forest rodents out of it & the feed (two-story coop). This one is not thermostatically controlled, so I have a plug-in that turns off & on when nearing freezing & when not near freezing (got one at the local feed store & another one at the hardware store which is used for heat tape or the like). In addition, I found a stainless steel dog type water/feed bowl that fits perfectly snug inside this smaller heated dog waterer; it makes the water change even easier.
Since ventilation is important & drafts are not good, I hang burlap fabric over the wire mesh windows of the coop to cut drafts & keep the "sideways" rain out in the fall & winter. In the real cold weather there are hinged shutters with clear wavy fiberglass that are let down over the windows with the burlap, but I always leave the shutters proped open a few inches for ventilation. I know someone who in the hot summer, hangs burlap on the hot side of her fenced chicken run & runs a mister on it to keep it damp; it cools thru evaporation & adds humidity to the run . Burlap also makes a good wind barrier on the chicken run fencing (windy side) without stopping ventilation when there's no wind.
Started corn in October to help with body heat, it's in a seperate free feeder; they love their corn on the cold days. My bantams are very prissy & seem to like the freefed, dry scratch that is 100% corn & also the overnight soaked cracked corn & soaked poultry wheat that I add hot water to in the morning for a warm breakfast.
QUESTION: Can anyone explain why they use the 2x4's instead of round roosts (seems to be mentioned for cold weather)? Just read some comments on BYC about using 2x4's for roosts. I assume that on the 4" side, their feet stay flat & the're able to tuck their bodies around their feet for warmth. Regarding chance of frostbite while roosting at night, I checked my bantams tonight on the (bantam sized) round roosts & their toes seem to be well covered with their body & feathers fluffed over the toes.
Thanks for all of the great comments, what a helpful "community" the BYC is.