Housekeeping · Condensation control

Window condensation: dry the sill and address indoor humidity

Dry indoor window moisture promptly, track humidity and improve ventilation near major moisture sources.

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Droplets on the room-facing side of a cold window can signal indoor condensation. The US EPA advises drying wet windows promptly, reducing moisture sources and keeping indoor relative humidity below 60% where possible, ideally 30–50%. Moisture on the outside surface is different; persistent wall leaks need professional assessment.

Your try-it-at-home checklist

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Check whether droplets are on the room side or outside. Wipe indoor glass and sill dry promptly.
Measure indoor relative humidity with a hygrometer. EPA advises below 60% where possible, ideally 30–50%.
Run bathroom exhaust during showers and kitchen ventilation during cooking; exchange indoor air when practical.
Review indoor drying, excessive humidifier use and other moisture sources; consider a dehumidifier if needed.
Make sure curtains and nearby furniture do not entirely block airflow at the window, and recheck the sill for standing water.
If mold, damp walls, peeling paint or leakage persists, do not assume it is ordinary condensation; request a building inspection.

Your try-it-at-home checklist

Further reading

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