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Having good weather stripping on your doors, will help save you energy but you should also have an insulated door. Many homes have a hollow exterior frame unit that cold air simply goes right through. Solid ones are better but are not as good as a well made insulated door. All homes built in cooler climates always have 2 outer storm doors that open into a vestibule or mud room, separated by another door to the main home. This common arrangement makes a lot of sense and helps keep the heat in and the cold out.