Q: There’s been a mysterious, slightly moldy smell in my home all summer, and this morning, when our window air conditioner kicked on, I noticed that the odor unmistakably came from the unit. I know ...

Mold in your air ducts isn’t just gross—it can make your home smell musty, cause respiratory problems, and exacerbate allergies. Since your HVAC system circulates air throughout your home, any mold ...