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Monitor indoor humidity with a hygrometer in six steps

Use the EPA's general 30–50% indoor relative humidity range while checking windows and other surfaces for condensation.

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US EPA

Original source: Monitor indoor humidity with a hygrometer in six steps

Link card to the US EPA original source

A hygrometer does not fix leaks or mold by itself. Pair readings with observations of the windows and walls to decide what to change.

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1. Choose an indoor humidity meter that displays relative humidity in percent. Check setup instructions before relying on readings.
2. Place it away from direct sun, heater drafts and humidifier mist, near the level where people usually spend time.
3. Record readings at comparable times, such as morning and evening. Focus on sustained humidity rather than a single reading.
4. Use the EPA's general 30–50% guidance, noting that colder winter windows may require lower indoor humidity to prevent condensation.
5. If water forms on window frames or walls feel damp, dry visible moisture and investigate cooking, showers, indoor laundry or leaks.
6. Improve ventilation or use appropriate dehumidification, then recheck. Seek professional help for persistent leaks, large wet areas or mold.