The Honeywell HCM-800 Cool Moisture Humidifier is a superior product great for medium size rooms. This model includes a permanent washable filter, saving you from the time and hassle involved with finding a replacement filter. Designed for low maintenance the PermaFresh permanent washable filter can save up to $30 a year in replacement filter cost. With an illuminated silent soothing waterfall the HCM-800 is up to 20% quieter than other permanent filter units. With up to 24 hours run-time per filling, three moisture settings to choose from, and an adjustable humidity control, this product is an excellent addition for any household.