Window Ventilation vs. Exhaust Fans in Cold Weather: What’s Better for Ceiling Mold?

https://betterbathroomliving.urbanvellum.com/posts/window-ventilation-vs.-exhaust-fans-in-cold-weather-what-s-better-for-ceiling-mold

Window Ventilation vs. Exhaust Fans in Cold Weather: What’s Better for Ceiling Mold? In winter, exhaust fans remove moist air from bathrooms or kitchens but can create negative pressure, pulling in cold, humid outdoor air that condenses on cold ceilings. Window ventilation, when done briefly during the day, lets in drier air and reduces indoor humidity without overcooling. For ceiling mold, a quick daily window crack often works better than running an exhaust fan nonstop.