How It Works

Damp Defender dehumidifiers use mild heat to warm, dry and circulate air in enclosed spaces, making them inhospitable for moisture, mold, mildew and allergens.

In a confined storage space, if the air is heated, the relative humidity will go down because warm air molecules are capable of holding more moisture.

The increased moisture carrying capacity of this air draws moisture out of the objects it passes (your clothes, shoes, boat, storage shed…).

As the air molecules are heated, they become more active and cause the pressure within the confined space to increase slightly, forcing some of the moisture-laden air outside to be carried away.

Then where does the water go?

You don’t have to collect water to dehumidify, you simply chase it somewhere else.

Think about your clothes dryer or your hair dryer – both increase the temperature of the air, essentially drawing the water out of your clothes or hair and dissipating it into the air. The heat rising carries the moisture out of your enclosed spaces, causing a continuous circulation of dry, fresh air.

What about desiccants or a regular dehumidifier?

Damp Defender has no toxic chemicals, requires no replacement crystals, has no reservoir to empty, and no down time for recharging or refilling. Simply place it where you need it, plug it in, and forget you ever had a moisture problem.

No Toxic Chemicals

Safe for your children and pets. The moisture absorbent in most common desiccants, Calcium Chloride, is a Hazardous Substance according to OSHA 29, CFR 1910.1200. Calcium Chloride is used as a killing agent (Herbicide, Insecticide, Fungicide, Microbiocide, Molluscicide) and CANNOT BE FILTERED from the water supply by conventional water treatment methods.


As a long-term solution to dampness, the Damp Defender (including the electricity to operate it) costs 3 TIMES LESS than absorbent crystals. Each dehumidifier runs at a low cost, ranging from just 3 to 10 cents per day! You may not even notice this minimal cost on your electric bill.

Environmentally Friendly

There is no need to throw away used-up absorbers, create a mess refilling crystals, or dump anything down the drain. No waste. No mess.

No Down Time

Rechargeable crystals need to be recharged every two weeks to keep working, absorbers stop working once they’re saturated, and dehumidifiers stop dehumidifying until emptied. Damp Defender has no downtime, ever. Once it’s plugged in it will continuously circulate air, keeping your spaces fresh and dry.


The Damp Defender is guaranteed to last for 10 years and we are confident you will enjoy the benefits of this product long after the guarantee expires! Within ten years, if the Damp Defender fails to heat, return it for an immediate free replacement.