You are very wise to research these issues before you get chickens. If more folks did that, this forum might be half empty, LOL!
I have not yet heard of folks on the forum dubbing for winter protection, but I now live in the mid-South where the only dubbing that takes place is for "game" (fighting) breeds. While I expect other northerners will soon submit info on this, my own research has suggested a couple of other safeguards against winter weather:
1) choose winter-hardy breeds - those with heavier feathering, and more importantly, small combs and wattles.
2) use coop and run insulation, construction, and/or heating that helps maintain decent temps.
In that light, you might (if you haven't already) do a quick search of the coop and run construction section of the forum. Very informative.
Again, kudos to you for researching!