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Just speaking from my own experience, but my chickens refuse to go outside once it starts snowing. Their run is covered, but as soon as the snow blows in, which it does, they get all wonky about walking around in it. I keep it pretty well shoveled, but the sand is frozen and they don't like it. I may try putting down some straw this year after the ground freezes to see if it helps. Anyways, if their house was completely dark, it might be a really really long winter for them. And you likely won't get any eggs.
I don't know what part of MI you are in, but you may need to consider how you plan to keep your water thawed. Do you have access to electricity? I use a heated dog water dish from Oct thru May.
Good that you are thinking of these things now before the real cold hits.