For RV lovers, Florida is the perfect destination; however, the humidity found in this region is a major factor against RVs. With average humidities regularly exceeding 70%, Florida’s air carries moisture, salt, and heat—a ‘triple threat’ to the RV which will usually give it less life expectancy than almost anywhere else.
For RV owners who travel through Florida, or store their RVs there, the humidity can create an environment conducive to mold growth, electrical corrosion, and structural delamination. A proactive approach to moisture management is the only way RVers can help prevent their trip from becoming an unplanned repair project.
Sealing the envelope: Roof and window inspections
The RV exterior shell is Florida humidity’s first line of defense against heat-related expansion, contraction, and micro-cracking in the seals around roof vents, A/C units, and windows. When humidity levels are elevated, moisture enters into the wall cavity through the microscopic cracks that are present, creating an environment where wood rot and black mold will thrive. RV owners need to perform a sealant audit on the exterior of their RV every few months looking for peeling or cracking in any Dicor or silicone bead.
In addition to the roof, the window seals and slide-out gaskets need to be maintained. The sun will dry out the rubber seals and make them more brittle, thus decreasing their ability to keep out the moist air of Florida. By applying a UV-protectant slide-out lubricant, it keeps the rubbers pliable and makes them a snug “envelope” when the RV is closed. Checking the undercarriage is also a good idea.
Most people will look upwards for leaks, while moisture from wet Florida ground can go up and affect the chassis and wood floor joists if the protective under-barrier is punctured or worn down.
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Interior climate control and air quality
After sealing the outside of the RV, it’ll be necessary to manage the amount of air contained inside the RV as well. An RV that is not in use in Florida can have interior temperatures exceeding 100 degrees with 100% humidity, creating a greenhouse effect ruining upholstery and electronics.
The best tool for this is a high-capacity dehumidifier. Although small (<1-gallon) or disposable moisture absorbers are popular, they usually cannot keep up with the volume created within a typical motorhome. A high-capacity electric dehumidifier that drains directly into a sink or grey water tank is a huge help when storing for long periods or when at the RV full time.
Airflow is equally critical to preventing stagnant pockets of moisture. Using MaxxAir covers allows roof vents to remain cracked even during Florida’s frequent afternoon thunderstorms, promoting cross-ventilation without letting rain inside. Inside cabinets and closets—areas where air rarely moves—owners should leave doors slightly ajar or use small fans to keep air circulating. This simple step prevents the “musty smell” that often plagues RVs that have been sitting in the humidity for more than a week.
You can also read: How the Orlando heat destroys truck batteries and how to prevent it
Protecting the mechanical and electrical systems
Moisture affects not only where you live but also quietly destroys the inner workings of the RV— its mechanical systems. High humidity speeds up the oxidation process on the electrical shore power plug and the battery terminals.
Applying a dielectric grease to the electrical connections will help to prevent green corrosion, which can lead to power surges or failure of the devices. The air conditioner (the most heavily used appliance in any Florida RV) also benefits from proper maintenance. Cleaning the evaporator coils and changing the air filters every month ensures that the air conditioner will be able to remove moisture from the air without freezing up.
Finally, for those with diesel pushers or larger motorhomes, humidity can lead to water contamination in the fuel tanks. As temperatures fluctuate, condensation forms on the inside of half-empty fuel tanks, leading to algae growth that can clog injectors and stall the engine on the highway. Keeping fuel tanks full and using a high-quality fuel stabilizer with a moisture dispersant is a vital preventative step. When the mechanical systems are protected from the damp environment, the RV remains a reliable home on wheels rather than a roadside liability.
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