I have searched the posts and I have read most of them but I still have a few questions. I live right on the southern shore of Lake Ontario, temps in winter are usually around 20-30 sometimes teens and negative numbers at night along with over 10 feet of snow. I have 13 chickens in a 10x10 coop, with 2 roosting bars made out of 2 inch dowls with one roost being a 2x4 flat so they can cover their toes. I have checked to see if the girls can cover thier toes on the 2 in dowl and they can, well I can't see toes, so I am assuming. There are 3 nesting boxes, 2 on the wall and one is a rubber tub, (2) 3 lb hanging feeders and a 3 gallon heated waterer. I have a normal light for egg production and 2 heat lamps. So far since it was been around freezing, I am leaving one heat lamp on but when it got to 8 degrees a few nights ago, I turned the 2nd on one. Am I now concerned that I am using the heat lamps and it isn't good for the girls. Since the snow has come, they aren't going outside as much, they are free range during th day and locked up at night. I think I have given all the info on my coop. Do any of you see a concern or thought? I have 3 Rhode Islands, 3 guineas and 7 Barred Rocks. I started out with 3 Barred Rocks but saw 4 Barred Rock chicks that weren't in the best living conditions so I bought them too. Thank you!