Hello We have a converted "Amish" style shed for a coop. It has a window that I'll close and two small vents on the sides that I was going to cover.. to prevent drafts.. Aside from closing the little exit door each night.. should it be insulated? It isn't now.. We live in mid state NY.. the winters can get cold but not for very long periods of time. We can have a week of sub zero.. but mostly it's in the 20's and 30's.. snow is iffy.. some winters lots.. others hardly any.. I was planning on letting them free range even in the winter.. is this a bad idea? They'll have access to their shelter at all times.. just like now.. Second question How to keep the water from freezing? We have electricity in the coop.. Can anyone suggest a good water heater that won't burn down the coop? thanks!