The Davis Instruments Air-Dryr 500 is a compact, maintenance-free electric dehumidifier designed to continuously fight mold, mildew, moisture, and corrosion in enclosed spaces up to 500 cubic feet. Unlike traditional dehumidifiers that collect and drain water, the Air-Dryr works by drawing cool, damp air in through the bottom, heating it above the dew point so moisture stays suspended in the air rather than condensing on surfaces, then releasing it through the top vents — using natural convection with no fan required.
With a 70-watt heating element drawing just 0.6 amps, operating costs are comparable to a standard light bulb. The unit features no switches, fans, thermostats, or moving parts, resulting in completely silent operation with virtually nothing to break down or cause a spark — making it safe even for use in marine engine compartments.
Key Features:
- Covers up to 500 cubic feet of enclosed space
- 70 watts / 0.6 amps — extremely low operating cost
- No fans, switches, thermostats, or moving parts — silent and trouble-free
- No drip pan or water reservoir to empty — zero maintenance
- Natural convection air circulation — no motor needed
- Thermal cutoff safety feature prevents overheating if air vents are blocked
- Safe to the touch — exterior stays cool during operation
- Spark-free operation — safe for marine engine rooms and bilges
- Durable, neutral beige polycarbonate housing
- Operates on standard 110/120V outlet
- UL Listed
Ideal for boats (cabins, bilges, V-berths, engine rooms), RVs, motor homes, trailers, basements, closets, storage units, gun cabinets, pump rooms, offices, and anywhere moisture build-up is a concern. Simply place on a hard, flat surface — ensure air vents are unobstructed — plug in, and allow 15–20 minutes to reach operating temperature. The rectangular unit measures 14" x 5" x 4.5" and is designed for continuous 24-hour use.
