What are the relative humidity limits recommended for residences?

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Multiple Choice

What are the relative humidity limits recommended for residences?

Keeping indoor relative humidity in a moderate range helps both comfort and health, while also protecting the house from moisture problems. If humidity gets too high, condensation, mold growth, and dust mites become more likely, which can affect air quality and damage surfaces. If it’s too low, the air can feel dry, irritating eyes, throat, and nasal passages, and dry wood or furniture can crack. The 40–60% range hits a balance: most people feel comfortable, mold risk is reduced compared with higher humidity, and moisture issues like condensation are less likely than at the upper end. That’s why 40% to 60% is the commonly recommended residence range. The other options either run too dry (20–40%) or too humid (60–80%), with 30–50% being reasonable but not as universally suitable as the broader 40–60% range.

Keeping indoor relative humidity in a moderate range helps both comfort and health, while also protecting the house from moisture problems. If humidity gets too high, condensation, mold growth, and dust mites become more likely, which can affect air quality and damage surfaces. If it’s too low, the air can feel dry, irritating eyes, throat, and nasal passages, and dry wood or furniture can crack. The 40–60% range hits a balance: most people feel comfortable, mold risk is reduced compared with higher humidity, and moisture issues like condensation are less likely than at the upper end. That’s why 40% to 60% is the commonly recommended residence range. The other options either run too dry (20–40%) or too humid (60–80%), with 30–50% being reasonable but not as universally suitable as the broader 40–60% range.

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