coop build insulate or no

[rottlady]

I know when building a barn even in cold places you don't insulate because it closes it up too tight and the animals are more prone to respiratory illness.
How about a coop?

My mother never insulated hers. My coop my birds were only in in the spring/summer/fall - they lived in a friends barn all winter

This was 30 years ago though. Anything changed? LOL