I can get 5 used windows for $10 that I could use for the coop. They're all aluminum though, so DH wanted to know why bother insulating the coop if we're not going to get good windows? For that matter, why insulate the walls if he wasn't going to insulate the roof. Well, I did intend for him to insulate the roof, he'd just prefer not to; says it will be too difficult. And all of the insulation and extra wood is expensive. So the questions are: 1. It seems like not everyone does insulate, though a lot do. Has anyone that hasn't regretted it or had to do it at a later date? 2. Is there any value to insulating the walls without doing the roof? 3. Is there any point to insulating anything if I use used single-pane, aluminum framed windows? Thanks!