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 ...

Humidifiers can treat a range of winter symptoms, including cracked skin, scratchy throats and nosebleeds — but only if you use them correctly.

Dry indoor air affects comfort, health, and homes during heating season. Knowing how whole-house humidifiers work helps contractors match homeowners with the right solution.