This dehumidistat is a key element in all moisture management plans outside of just plugging in your dehumidifier. The unit acts as a switch, turning power on and off to a dehumidifier and suppliment fans as the humidity rises and falls. It allows a "whole crawl space" approach to dehumidification. With is dehumidistat most quality dehumidifiers can control moisture in double the space as what they were originally rated for. For example- The Compact Air Plus is rated for 1600 sq ft at 3' high. With a dehumidistat and the proper amount of suppliment air movement (supplied by fans) the Compact Air Plus can dehumidify nearly 3500 sq ft. 

*Note- For this to work efficiantly, a proper moisture managment plan must be formulated. It can be complicated to get the right results, please consult with us at the time of purchase.