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.

A reader recently asked for advice about whether to operate a humidifier on his furnace, fearing it would lead to mold issues on duct insulation. I told him to use it, but to be vigilant. Bill Kane of ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Dry winter air can cause more damage to your home than you might expect. If humidity levels are too low, ...