With no switch, fan or thermostat, the silent Air-Dryr stays trouble-free and draws no more energy than a light bulb. A thermal cutoff shuts down the unit if air flowing into the unit becomes impeded. Air-Dryr has no components to cause sparking, so it's safe for marine use in cabins, V-berths and engine rooms. Made of durable polycarbonate, the Air-Dryr 500 from Davis Instruments handles up to 500 cubic feet and draws only 0.6 amps and 70 watts, and measures 14 inches (length) by 5 inches (width) by 4.5 inches (height). The Air-Dryr 1000 handles 1,000 cubic feet and draws 1.1 amps and 130 watts, and measures 13.5 inches in diameter and is 4.25 inches high. Standard dehumidifiers can retail for $200 or more, but the Air-Dryr 500 costs only $59.99 and the 1000 only $69.99.