Aprilaire 1750A Ductable Dehumidifier Provides three times the moisture removing capacity of leading portable dehumidifiersup to 135 pints or 16.88 gallons per day No messy tanks to empty and cleanever Automatically senses moisture levels and maintains optimum humidity levels in your home, never too much, or too little and running only when needed Switches automatically between whole-house dehumidification when central air-conditioning system is running Can be operated manually, allowing you to monitor and control moisture levels in a specific location (with living space controller)