Both can ease dry air—but one may be safer if you have kids or pets.

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A humidifier is a device designed to add moisture to the air by releasing water vapor or steam. Humidifiers can alleviate issues such as dry skin and frequent nosebleeds, often exacerbated by dry air.

Cool-mist humidifiers are the choice of most Americans seeking to alleviate dryness in their homes. These machines dominate the market because they pose fewer safety risks than warm-mist humidifiers, ...

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