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Window condensation: wipe the moisture, then check ventilation and sources

If indoor window condensation returns, dry the surface promptly, ventilate during cooking and showering, and check humidity and cold surfaces. Persistent wall dampness may also point to leaks or insulation problems.

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The US EPA advises drying condensation on windows, walls and pipes promptly and reducing its moisture source. Its suggested indoor humidity is below 60%, ideally 30–50%, but condensation also depends on surface temperature and indoor-outdoor differences. First determine whether droplets are indoors or on the exterior glass.

Your try-it-at-home checklist

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Check whether the droplets are on the indoor or outdoor side of the glass. If indoors, inspect nearby frames and wall surfaces for dampness.
Wipe the indoor glass and frame promptly with a dry cloth, then dry the cloth. Keep dripping water away from outlets and floors.
Measure indoor relative humidity with a hygrometer. EPA suggests below 60%, ideally 30–50%; avoid driving humidity excessively low.
Run exhaust ventilation while cooking, showering or drying laundry. When outdoor air is very humid or polluted, use appropriate ventilation or dehumidification rather than opening windows indiscriminately.
Check for blocked airflow and cold surfaces. Adjust practical ventilation, heating and moisture control without assuming that more heat alone fixes everything.
If moisture, wall staining or mold repeatedly returns, ask property maintenance or a specialist to investigate leaks, thermal bridges or ventilation. Do not paint or paper over wet material.

Your try-it-at-home checklist

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