Davis Air-Dryr 500 & 1000 Bundle, Quiet Dehumidifier for Confined Spaces, Covers up to 1000 Cubic Feet (2 Items). Air-Dryr is an inexpensive and effective way to fight moisture problems, cold drafts, & corrosion. Designed to operate anywhere, 24 hours a day. Use Air-Dryr on the floor in any damp, enclosed space and plug into a 110/220 volt outlet. Air-Dryr costs no more to operate than a lightbulb.