Should I insulate my coop?

[Tbone101]

I live in Minnesota and the winters can get pretty cold and I will be having chickens in there all year long and I was wondering if I should insulate it or not?

Any ideas?

 

[bargain]

I think it would be a good idea. And also have widows for ventilation which is sooo important. My only caution would be to cover the insulation with another product so the chickens, don't start pecking at it!