As you don't have a heater inside the home to introduce outside air for combustion, you have the normal condition of a home where moisture is produced from cooking and cleaning. Reducing moisture production by covering pots and any other moisture source will help. Canadian provinces require air exchangers to help with this problem. Can't tell if you are in a lake area where high moisture outside is the norm; but in land areas, opening a window a crack can dilute the humidity with dry outside winter air.
Friends tell people how to live past 60.