I do know that leftovers from the house help, and the more time running free helps, might even put you over the hump in the warmer months. Feeding the right stuff from the garden also helps, but it is quite difficult to make anything that resembles a profit.

If the chickens are in a draft free environment they do winters pretty well. Probably some frost bite on the combs. This usually heals and does little aside from making the combs look lousy.

I have done about the same as you. I got my plow ready, plus my snowblower, cleaned up the garden, taken out the a/c, and just settling back.