My opinions have gotten me in trouble a time or two. Funny it is ok to have one view, but not another.
What I want is strong, vigorous, and healthy birds. We give them good feed, clean water, adequate housing, and a healthy environment. They get wormed twice a year, and checked for lice and mites regularly. That is all I intend to do. Give them a fair shot at doing well. If that is not good enough, they are not good enough.
I think a lot of what we do makes us feel better.
No heaters, fans, special feed, or lights for heat. We do not need it here. If the housing is adequate, they are fine. All I did was keep the wind off of them, and with the shelters deep enough to be sheltered on the roost, they all did fine. Not a comb or wattle is blemished.
The only thing I might adjust is to install some functional shutters that I can close in windy cold weather.
I will admit that all of this is easy to say living in the South. If I lived in the upper Midwest, my approach might be different. For one I would probably have a different breed, and another is my housing would be set up differently.
This is what I do in the Pacific Northwest too. Can't beat good hardy stock. My biggest climate challenge is extra moisture, especially thick thick fog that in winter time sometimes does not burn off, and makes the pen bedding damp, which can lead to pneumonia/other illness if not careful. Adult birds are ok, but it can be challenge for young birds still, but they either make it or they don't, no weakness needed. I try to avoid late hatches for this reason, I want at least 6 months old by October if at all possible