No matter if your RV has been in storage, or if you use it full time, humidity can become an issue in your RV. Even with the colder, drier air found in the winter months, if your motorhome stays closed up for an extended time moisture can still build up inside. Humidity levels can rise due to several causes, such as cooking inside, taking a shower, outside weather, or even your own breathing. Anytime water, especially hot water, is used in your RV, the potential for high humidity is there. Just like in your home, this can lead to wood rot and metal corrosion in your furniture, walls, floors, and the vehicle structure itself. It also causes the growth of mold & mildew, which can become a health hazard, especially for those who are allergic. Warm, damp air in your RV can also attract certain bugs and insects.

Of course, you don't want the air in your RV to dry out too much either. Ideally, for everyone's comfort the humidity should be under 50%, but no lower than 30%. If you have a weather station, like one from Minder Research, it can tell you the inside humidity level. There are multiple ways to prevent excess humidity in your RV. When the surrounding conditions allow for it, making sure there is airflow inside the RV makes a difference. This is especially important to keep in mind if you'll be using hot water during cooking or washing. A window or vent should be open to allow the damp air to escape. If possible, allowing ventilation during the night while you sleep is also helpful. Make sure seams around bathroom fixtures are in good condition as well. If the RV is in storage, your RV cover should still allow for air to pass through.

In warm weather keeping your RV ventilated is almost done without a second thought, as vents or windows are open to let the breeze in, or the air conditioner runs to keep things cool. When ventilation isn't an option, RV dehumidifiers can help make up the difference. They are designed to draw in moisture from the air, preventing it from collecting. Using up electricity with a dehumidifier doesn't have to be a worry with non-electric units. They use crystals that take in moisture, collecting it inside. Once the crystals reach the saturation point, they are replaced.

Non-electric dehumidifiers are available from Dri-Z-Air, DampRid, and Star Brite. They all work in a similar fashion, with the ability to draw in moisture from any direction. Dri-Z-Air works in spaces up to 10' x 10', Star Brite treats up to 1800 square feet, while DampRid is ideal for smaller areas, such as a single room or living area. Replacement crystals are also available for each unit.

Preventing Moisture Build-up In Your RV