The Holmes® Whole House Cool Mist Humidifier creates purified mist and can humidify your entire home. This cool mist humidifier includes a filter to trap and remove impurities and odors for fresh, clean moisture. It propels cool mist for up to 24 hours on its Low setting. The water tank contains antimicrobial protection to prevent mold and bacteria growth. This Holmes humidifier has 3 mist output settings to humidify your home and features digital LCD controls for easy use.