Experts explain what to look for in air purifiers and humidifiers.

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Every winter, humidifiers seem to pop up everywhere. Stacked on store shelves, spotlighted in home-care roundups and quietly humming in bedrooms across the country. And it’s not hard to understand why ...

In winter, a humidifier can keep dry air at bay, but you can only reap the benefits if you follow these maintenance tips to keep it clean and working well.