How it works
Evaporative units move air through a wet wick, warm-mist units boil water, and ultrasonic units create a fine mist. Each design has different cleaning and mineral concerns.
What people often miss
Too much humidity can encourage mold and dust mites. Use a hygrometer, change water regularly, and follow cleaning instructions to avoid dispersing microbes or mineral dust.
Why this question comes up
Dry winter air makes the added moisture feel helpful, but more is not always better.
Key points
- A humidifier adds water vapor or tiny droplets to indoor air through evaporation, steam, or ultrasonic vibration.
- Evaporative units move air through a wet wick, warm-mist units boil water, and ultrasonic units create a fine mist. Each design has different cleaning and mineral concerns.
- Too much humidity can encourage mold and dust mites. Use a hygrometer, change water regularly, and follow cleaning instructions to avoid dispersing microbes or mineral dust.
Bottom line
A humidifier adds water vapor or tiny droplets to indoor air through evaporation, steam, or ultrasonic vibration.
Source and verification
This Answer was checked against U.S. Environmental Protection Agency. Follow the source for the full official explanation and any later updates.