Do what you can to help. Keep the curtains closed on non sunshine windows. Minimize running exhaust fans in kitchen and bathroom. Make sure you keep a door open on any exterior wall sinks. Block any drafts you can with blankets or towels. Bake that extra turkey you have in the freezer.

If you have a heat pump, there is not a lot you can do this low. It’s a trade off worth taking for the savings 99% of the time.