I have a 36x40 pole barn, condensation blanket in the roof and some plywood on the walls to protect the metal. It's cold, we were down to -16 (felt like almost -40 according to the internet) at my place over the weekend. Batteries to cold to start kind of cold. It sucks!
In the spring, every few years, we'll get what they call Chinook winds that will blow in and temps will go from highs of 20s to 60! The problem is that the warm air sucks all that water out of the snow and when a car or peice of equipment is cold soaked the warm air will piss all over everything. I had water flowing out of my barn as it streamed off every cold surface on 5 cars! Cars that were (mostly) rust free that now have rust on every fastener or clean spot (rotors get roached). The main reason I want to insuakte my barn is to avoid this.. If the cars are kept above the dew point they won't sweet. Think of a cold glass on a summer day. Either the air needs to be kept cool to prevent the dew point rising, or the car needs to be warm to prevent condensation formation. Same goes for house and shop walls, windows, doors, etc.
Buddy of mine has a 60x100 including the dried in lean to. The main 60x80 is 8" lumber with spray foam, r65 ceiling mix of foam and glass and r-oh-my-god roll up doors. He keeps it at 55 with a furnace and it costs him something like $150/m ollo more than just the house alone.
