Do those two outside walls for yourself!
Our climate is similar to yours and you will be more highly motivated to remain in the coop in winter to get those chores done!
This is how we insulated ours-
https://www.backyardchickens.com/web/viewblog.php?id=7693-Coop_Insulation
Our climate is similar to yours and you will be more highly motivated to remain in the coop in winter to get those chores done!
This is how we insulated ours-
https://www.backyardchickens.com/web/viewblog.php?id=7693-Coop_Insulation