When you talk about us newbies needing the courage to start, and trios in pens that are 4x8, it makes me want to throw up my hands and give up in our climate. How are these pen sizes determined? For instance most of what I read says a standard chicken needs 4 square feet, but a 4x8 pen gives them ten and a half! I don' t know how I would keep them warm in that situation. I guess that is what the roosting box is for.
I always turned the lights on my layers in the early morning and let them go to bed with the sun, but the problem I have is four those 5-6 hours before I get up they are up and have no water except one big ice sculpture!
I went to visit a local Master breeder to see what he does in our climate. He was very helpful, but He breeds Wyandotte's and white rocks, not leghorns. Of course he and I are both raising bantams. He told me the difference for me would be the tails on the leghorns are much bigger than his birds so they would need more room but he was never raised leghorns.
He has an insulated room, that has pens stacked 3 high. He keeps a trio or quad of birds in pens that are 32" deep and 48" long, and 20" tall. Then he has some 24" x24" that he uses for conditioning or to put a pair of birds in for breeding. He has a lot of cages for single males that are 16" deep and 24 inches long, and the male reaches out through a hole in the front for water and feed. His birds are beautiful, the guy wins, a lot, and has won awards from the APA, but I don't know how to apply what he does to leghorns.
He told me that with these pens filled in winter the water hardly ever freezes because the birds can keep themselves warm. He has shown poultry for 55 Years, he was tell me.