I'm currently using two coops for my 3 healthy hens. Two RIR fatties live in a Suncast (like a rubbermaid) shed. I lock the doors at night and open up in the day for them to run around the yard. Another is in a typical backyard coop, but I'm thinking that for the winter I'll put the two next to eachother and encourage the third hen to go into the shed. That said, and considering I live in NYC where the winters are cold but not like Alaska, what other things I can do to make their lives cozy in the winter? I can buy a heated water dish running an extension cord and I can buy a panel heater, once again running an extension cord, but if I don't have to I'd rather not as I always fear fire. If I left the shed doors open in the day and then at nite close them and maybe add a little heat, would that work? Any suggestions sure would be appreciated.