Housekeeping · 실내 환경

Indoor humidity in 6 steps: use a hygrometer and manage moisture sources

Using US EPA guidance—generally 30–50% relative humidity and below 60% where possible—learn to measure indoor humidity, ventilate appropriately and respond to condensation or leaks.

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Wikimedia Commons / Maasaak · Maasaak / Wikimedia Commons, CC BY-SA 4.0; unmodified photograph; https://commons.wikimedia.org/wiki/File:Living_room_weather_station.jpg · CC BY-SA 4.0 ↗

Humidity is hard to judge by feel alone. The US EPA advises keeping relative humidity below 60% if possible, ideally around 30–50%, to help manage moisture and mold risk. This is general guidance, not a guarantee for every home. The example photo shows a hygrometer, not a reading from your room.

Your try-it-at-home checklist

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1. Use a hygrometer or combined thermometer-hygrometer to measure relative humidity (%). Check both a living area and any room prone to condensation; compare readings before and after showers or cooking to identify moisture-producing activities.
2. Use EPA advice as a general benchmark: below 60% relative humidity where feasible, ideally 30–50%. Also watch actual condensation because risk depends on room temperature, season and building surfaces, not just a single number.
3. Run the bathroom exhaust fan after showering and use suitable kitchen extraction while cooking. Opening windows for long periods is not always helpful when outdoor air is more humid; choose ventilation or dehumidification according to conditions.
4. If windows, walls or pipes collect droplets, wipe them dry and note where moisture repeatedly appears. Inspect corners of exterior walls and spaces behind furniture too. Drying visible water is not a substitute for fixing its source.
5. Stop leaks and dry affected materials promptly when it is safe to do so. EPA explains that in many cases drying wet materials within 24–48 hours after a leak helps prevent mold growth. Avoid handling wet electrical systems or contaminated floodwater yourself; seek qualified assistance.
6. Track humidity and condensation for several days and adjust ventilation or moisture control. If mold is extensive or keeps returning, investigate leaks and airflow rather than painting over it; arrange appropriate professional assessment.

US Environmental Protection AgencyA Brief Guide to Mold, Moisture and Your Home ↗EPA moisture guidance: if possible humidity below 60%, ideally 30–50%; promptly address condensation and dry wet materials within 24–48 hours to reduce mold risk.US Environmental Protection AgencyCare for Your Air: A Guide to Indoor Air Quality ↗EPA recommends indoor humidity between 30% and 50%, measuring with a humidity gauge, and ventilating or conditioning air according to moisture conditions.Wikimedia CommonsFile:Living room weather station.jpg ↗Original photograph of hygrometer and thermometer by Maasaak, licensed CC BY-SA 4.0 and verified on file page.Wikimedia CommonsCommons:Reusing content outside Wikimedia/technical ↗Hotlinking permitted from Wikimedia servers while creator credit and individual file reuse license requirements still apply.

Your try-it-at-home checklist

Further reading

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