Laundry Drying Indoors and Window Condensation

A full load of wet laundry can release a large amount of water into indoor air as it dries. In a cold-climate house, that vapour often shows up the next morning as wet glass — especially in bedrooms and rooms that stay closed overnight.

Why indoor drying wets windows

• Water leaves the clothes as vapour and raises room humidity for hours
• Closed doors keep that moist air from mixing with drier parts of the house
• Cold outdoor air cools the glass; when room air hits dew point on the pane, water appears
• Unvented or poorly vented dryers dump moisture indoors instead of outside

A practical laundry plan

1. Prefer a dryer that vents outdoors, and confirm the outdoor flap opens when the dryer runs.
2. If you must use a drying rack, put it in a room with an exhaust fan or an openable window, not in a closed bedroom overnight.
3. Run a bathroom or kitchen exhaust fan while racks are loaded, and for a while after, so humidity has somewhere to go.
4. Space loads across the day instead of stacking several wet loads into the evening before outdoor temperatures drop.
5. Log bedroom humidity on laundry days with a hygrometer; if mornings spike only after indoor drying, you have found a main source.
6. Wipe sills in the morning so standing water does not soak paint while you fix the drying habit.

Renters and shared laundry rooms

You may not control the building dryer vent. You can still avoid overnight bedroom racks, crack a door for mixing if fire safety allows, and report a dryer that leaves the laundry room steamy with no outdoor exhaust. Describe times of day and which rooms fog — that is more useful than a vague “the windows sweat.”

Indoor drying is one moisture source among many. Pair this with bathroom fan timing and kitchen steam control if windows stay wet on non-laundry days.

Originally published at https://dry-glass-notes.surge.sh/articles/laundry-drying-indoors-window-condensation.html (AI-assisted, sources cited). If this helped, zaps go to hollisvarrow3753@coinos.io.