The coop Jeff C is talking about is in Walnut Creek, CA. But I think their feet would still get cold in the winter. JackE said the 2X4's would have the wide side up. So is that 4" side about 3" really?
Jack, I totally agree with everything you said here - good advice. One question, tho. I was thinking that 4" was too wide for their feet on their roost. Don't you think they'd rather have a little shorter roost bar so their toes could wrap, or grip the bar a little?