The air conditioning unit will dehumidify the air, but is limited by the thermostat setting for temperature. We installed a SaniDry Dehumidifier and ducted it into the open space. The humidistat is set for 55% relative humidity and the unit will turn on any time the humidity rises above 55%. The SaniDry also has a dual filter system to filter the air down to 2 microns in size. Our stand-alone SaniDry Dehumidifier will eliminate the musty smells usually associated with basements for many years to come.