Yes skip the insulation, we did it and it encouraged mice to nest and breed. Then we had some running around with no hair on their backs. It was awful!! I put mine into the chicken barn, though we don't have and chickens at the moment. We live in Canada so I would like to hear what everyone's opinion on heating the coop, last year was nasty we had -28F for most of Dec/Jan. We had a space heater in there for the last of our chickens however I am reading that Guinea's don't do as well with the cold. Ideas?