DIY Dehumidifiers for Vents

Dehumidifiers collect moisture in the air to reduce humidity levels. Most dehumidifiers are large, electric appliances. If vents in the home collect moisture, there’s a simple solution using calcium chloride to reduce the humidity. Calcium chloride is commonly used on sidewalks and driveways to reduce ice and moisture after snow. It attracts moisture and dries areas to make walkways safe and clear driveways after plowing or shoveling snow.

Things You'll Need

• Plastic containers
• Calcium chloride crystals (ice and snow melter)
• Plastic wrap
• Rubber bands

Instructions

1. Gather one or several small, plastic containers. The containers should be small enough to sit inside or outside the vents that require dehumidifying.

2. Pour calcium chloride into each container about ½ full.

3. Place plastic wrap over each container and secure it with a rubber band. Poke several holes in the plastic wrap for ventilation.

4. Place the plastic container in or near each vent.

Tips & Warnings

• As the calcium chloride attracts moisture in the air, the crystals will bond and look like a white rock with water around it. The crystals are still working.

• Check the plastic containers every two weeks. If water accumulates around the crystals, dump the water down the drain.

• Replace the calcium chloride every two months. Dump the water down the drain and dispose of the leftover crystals in the trash.

• Calcium chloride is harmful if swallowed.

• If the plastic container spills, clean it thoroughly with a dry rag, then wipe the area clean with a wet rag. The water collected in the plastic container is mixed with calcium chloride and will continue to collect moisture. The spill will grow over time if the calcium chloride is not removed.