Plastic over windows helps immensely. And I am not sure how your windows are setup; but caulk around the open edges (if they caulked, and left holes) can help also.
Those "draft dodger" things, or even a rolled-up towel, can also help with any spaces left under doors (like our closet doors; our closet is freeeeezing, so we roll towels up and put them in the small gap under the door.. weems to help.
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