I was hoping someone could give me specific help with winterizing this coop please? Its my first time...It was existing when we bought this house last year inside of the barn. There is a run door as well - to outside area. The barn has 4 large sliding barn doors which I think can be a little drafty. We moved in in January and I recall the barn being as cold as it was outside. The back and left of this photo are exterior walls which have vents for air circulation. We are contemplating putting plastic up on this front side over the hardware cloth and covering all of the barn doors since we won't need to use them (there's another standard entrance door as well). There is no heat and we do not plan to use any. Is there a need to insulate the exterior walls? Edit to add we are in NH... can get pretty cold here. Thanks so much!