Living in an RV offers freedom and adventure, but moisture buildup can quickly dampen the experience. High humidity in these confined spaces creates condensation on windows, musty odors, and potentially harmful mold growth. A quality dehumidifier specifically designed for RV use is essential for maintaining air quality, preventing water damage, and protecting your investment. These specialized units remove excess moisture while accommodating limited space, varying power situations, and the unique challenges of mobile living. Finding the right dehumidifier balances effectiveness with energy efficiency, noise levels, and size considerations to ensure your RV remains a comfortable, healthy environment no matter where your travels take you.
RVs are particularly susceptible to humidity problems due to their confined space and activities like cooking, showering, and even breathing that release moisture into the air. Excess moisture in an RV can cause serious structural damage, including rot in wooden components, corrosion of metal parts, and deterioration of upholstery and fabrics. Beyond physical damage, high humidity creates the perfect environment for mold and mildew growth, which can trigger allergies and respiratory issues.
Temperature fluctuations between the inside and outside of your RV exacerbate condensation problems, particularly in colder weather when warm air inside meets cold windows and walls. This condensation can seep into insulation, creating long-term problems that are expensive to repair. Even when stored, RVs remain vulnerable to humidity damage, making dehumidification important year-round.
Many RV owners discover humidity issues after noticing foggy windows, a musty smell, or feeling dampness in bedding or clothing. By this point, moisture may already be causing damage. Preventative dehumidification is far more effective than dealing with established moisture problems after they’ve begun affecting your RV’s integrity.
Types of Dehumidifiers Suitable for RVs
Several dehumidifier technologies are available for RV use, each with distinct advantages and limitations. Understanding these differences helps select the most appropriate option for your specific needs:
| Dehumidifier Type | How It Works | Pros | Cons | Best For |
|---|---|---|---|---|
| Compressor/Refrigerant | Draws air over cold coils to condense moisture | High efficiency, handles large spaces, continuous drainage options | Higher power consumption, noise, heavier | Larger RVs, high humidity areas |
| Thermo-electric/Peltier | Uses electric current across metal plates to create cooling surface | Quiet operation, energy-efficient, compact, no compressor | Limited capacity, less effective in larger spaces | Small to medium RVs, moderate humidity |
| Desiccant | Uses moisture-absorbing material (usually silica gel) to trap humidity | Works in lower temperatures, quiet, lower energy usage | Slower operation, replacement desiccant costs | Cold-weather camping, small spaces |
| Rechargeable/Renewable | Uses crystals or materials that absorb moisture and can be “renewed” by heating | No power needed during operation, completely silent | Limited capacity, requires periodic recharging | Stored RVs, small spaces, no power situations |
Compressor dehumidifiers typically remove the most moisture but consume more power, which can be a limiting factor when boondocking or using limited electrical hookups. Thermo-electric models strike a balance between performance and energy consumption, making them popular for medium-sized RVs with standard power availability.
For RVers traveling in colder climates, desiccant dehumidifiers offer an advantage as they continue to work effectively at lower temperatures where compressor units may struggle. Finally, renewable dehumidifiers provide a no-power option for stored RVs or situations where electricity is unavailable.
Top Dehumidifiers for RVs
After examining dozens of models designed for mobile and small space use, these dehumidifiers stand out as the best options for various RV situations and needs:
Best Overall: hOmeLabs 1,500 sq. ft Energy Star Dehumidifier
The hOmeLabs unit consistently ranks as a top performer for RVs due to its balance of power and efficiency. This 30-pint dehumidifier can handle spaces up to 1,500 square feet while still being compact enough for larger RVs. Its Energy Star certification means lower operating costs, and the continuous drain option eliminates the need for frequent tank emptying. Users praise its quiet operation and moisture removal capacity even in high-humidity environments.
Best Compact Option: Eva-dry E-333 Renewable Mini Dehumidifier
For smaller RVs or specific problem areas like closets or cabinets, the Eva-dry E-333 provides targeted moisture control without requiring power during operation. Using moisture-absorbing silica gel beads that change color when saturated, this unit can be “recharged” by plugging it in for 8-10 hours every 2-4 weeks. Its small footprint (9″ x 8.25″ x 2.5″) and completely silent operation make it ideal for bedrooms and tight spaces.
Best for Boondocking: Pro Breeze Electric Mini Dehumidifier
The Pro Breeze thermo-electric dehumidifier strikes an excellent balance between effectiveness and power consumption for off-grid RVers. Drawing only 23 watts of power, it can still extract up to 9 ounces of water daily in spaces up to 150 square feet. Its energy efficiency makes it compatible with solar setups and battery power systems commonly used when boondocking. The auto-shutoff feature when the 16oz tank is full adds safety for unattended operation.
Best High-Capacity Option: Frigidaire FFAD3033R1 30-Pint Dehumidifier
For larger Class A motorhomes or fifth wheels facing serious humidity challenges, the Frigidaire delivers exceptional moisture removal capability. This unit can extract up to 30 pints of moisture daily while maintaining relatively low energy consumption for its class. Features include a washable filter, digital humidity readout, and continuous drain option. Its custom humidity control allows users to set their preferred humidity level for optimal comfort.
Best Budget Choice: SEAVON Electric Dehumidifier
At approximately one-third the price of premium models, the SEAVON provides effective dehumidification for small to medium RVs without breaking the bank. This thermo-electric unit operates quietly (under 35dB) and can remove up to 10 ounces of water daily in spaces up to 170 square feet. Despite its budget-friendly price, it includes features like auto-shutoff and LED indicator lights found in more expensive models.
| Model | Capacity | Coverage Area | Power Usage | Weight | Price Range |
|---|---|---|---|---|---|
| hOmeLabs 1,500 sq. ft | 30 pints/day | 1,500 sq. ft | 260 watts | 30.5 lbs | $180-220 |
| Eva-dry E-333 | 6 oz between recharges | 333 cubic feet | No daily power (recharge only) | 1.1 lbs | $15-25 |
| Pro Breeze Electric Mini | 9 oz/day | 150 sq. ft | 23 watts | 2.4 lbs | $45-60 |
| Frigidaire FFAD3033R1 | 30 pints/day | 1,500 sq. ft | 320 watts | 34 lbs | $200-250 |
| SEAVON Electric | 10 oz/day | 170 sq. ft | 25 watts | 2.5 lbs | $35-50 |
Features to Consider When Buying an RV Dehumidifier
Selecting the right dehumidifier for your RV requires evaluating several critical features that impact performance, convenience, and suitability for mobile living. Consider these factors before making your purchase:
Size and Capacity
Match the dehumidifier’s capacity to your RV’s interior space. Capacity is typically measured in pints of water removed per day. For most travel trailers and Class B/C motorhomes, units rated for 10-20 pints are sufficient. Larger Class A motorhomes may require models capable of 25-30 pints daily, especially in humid climates. Remember that oversized units waste energy while undersized ones won’t adequately control humidity.
Power Consumption
Power usage is especially important for RV applications. Look for Energy Star rated models that maximize efficiency, particularly if you’ll be running on limited shore power, generator, or battery systems. Thermo-electric and desiccant models typically use less electricity than compressor types but also remove less moisture. Some models list amperage draw, which helps calculate compatibility with your RV’s electrical system.
Noise Level
In confined RV spaces, noise becomes more noticeable. Most manufacturers list decibel (dB) ratings – look for models under 50dB for comfortable living. Compressor-based units tend to be louder than thermo-electric or desiccant types. Some models offer “quiet” or “sleep” modes that reduce fan speeds during sensitive times, such as sleeping hours.
Drainage Options
Dehumidifiers collect water that must be emptied regularly. Models with continuous drainage capabilities are particularly valuable in RVs, as they can connect to plumbing systems or drain outside without requiring manual emptying. If continuous drainage isn’t available, look for units with larger collection tanks and auto-shutoff features that prevent overflow when the tank reaches capacity.
Auto-Restart and Built-in Humidistat
Power fluctuations are common in RV life. Dehumidifiers with auto-restart capability will resume operation at previous settings after power interruptions. Models with built-in humidistats monitor and maintain your desired humidity level (typically 40-50% is ideal), cycling on and off automatically to optimize both comfort and energy usage.
Portability and Storage
Consider how the dehumidifier will be stored when not in use or during travel. Look for compact designs with built-in handles, lightweight construction, and cord storage features. Some models include wheels for easier movement. The ability to secure the unit during transit is important to prevent damage from the normal vibrations and movements of RV travel.
RV Dehumidifier Placement and Usage Tips
Proper placement and operation significantly impact how effectively your dehumidifier manages moisture in your RV. Follow these guidelines to maximize performance:
Optimal Placement Locations
- Central locations work best for whole-RV dehumidification, allowing air to circulate throughout the space
- For larger RVs, position the unit in the most humid area (often bathrooms or kitchens)
- Maintain at least 6-12 inches of clearance around the unit for proper air circulation
- Elevate the dehumidifier slightly off the floor when possible
- Keep away from dust-producing areas that could clog filters
- For stored RVs, place renewable dehumidifiers in closets, cabinets, and other enclosed spaces prone to moisture
Operating Best Practices
Set your dehumidifier to maintain 40-50% relative humidity – this range inhibits mold growth while avoiding excessive dryness that can damage wood components. Use higher fan speeds initially to reduce humidity quickly, then lower settings for maintenance and quieter operation. When actively using water in your RV (showering, cooking), temporarily increase dehumidifier operation to manage the additional moisture produced.
During cooler weather, ensure your RV maintains a temperature above 65°F when using compressor-based dehumidifiers, as they become less effective in colder conditions. For winter camping, consider switching to desiccant models that perform better in lower temperatures. Always empty water collection tanks before traveling to prevent spills and potential water damage.
Many RVers coordinate dehumidifier usage with ventilation systems. Running your dehumidifier after using exhaust fans helps remove residual moisture that ventilation alone misses. For maximum efficiency, close windows and doors while the dehumidifier is operating to avoid introducing additional outdoor humidity.
Maintenance and Troubleshooting RV Dehumidifiers
Proper maintenance ensures your RV dehumidifier performs efficiently throughout its lifetime. Follow these essential care procedures:
Regular Maintenance Tasks
- Clean or replace air filters monthly during regular use (more frequently in dusty environments)
- Wipe down collection buckets with mild soap and water to prevent mold and bacterial growth
- Check and clean air intake and exhaust grilles to maintain proper airflow
- Inspect continuous drain hoses for kinks, clogs, or damage
- Vacuum condenser coils (on compressor models) twice per season to maintain efficiency
- Sanitize the water tank and internal components with a vinegar solution twice yearly to prevent odors and extend unit life
For renewable desiccant models, follow the manufacturer’s instructions for “recharging” the unit when the indicator shows saturation. Typically, this involves plugging it in or heating it to drive off collected moisture. Monitor color-changing indicators and recharge before complete saturation for maximum effectiveness.
Common Problems and Solutions
| Issue | Possible Cause | Solution |
|---|---|---|
| Unit doesn’t power on | Power supply issue, full water tank | Check electrical connections, empty water tank, verify tank properly seated |
| Poor moisture removal | Dirty filter, impaired airflow, temperature too low | Clean/replace filter, clear obstructions, ensure room temperature above 65°F |
| Water leakage | Unit not level, damaged tank, improper drainage setup | Level the dehumidifier, check tank for cracks, verify drain hose installation |
| Excessive noise | Uneven surface placement, loose components, damaged fan | Place on flat surface, tighten accessible screws, contact manufacturer for internal issues |
| Frost on coils | Operating in too cold conditions | Move to warmer location or switch to desiccant dehumidifier for cold weather |
| Auto-shutoff malfunctions | Dirty or stuck float mechanism | Clean water tank and check float for free movement |
Most modern dehumidifiers include diagnostic indicators that help identify problems. Refer to your owner’s manual to interpret error codes and follow recommended troubleshooting steps. Keep your warranty information accessible for manufacturer support if needed.
Alternative Moisture Control Methods for RVs
While dedicated dehumidifiers provide the most effective moisture control, several supplementary or alternative methods can help manage humidity in your RV:
Moisture Absorbers and Desiccants
Disposable moisture absorbers like DampRid, calcium chloride crystals, or silica gel packets offer passive humidity control without requiring power. These products work well in small enclosed spaces like closets, cabinets, and storage compartments where electrical dehumidifiers aren’t practical. While less powerful than electric units, they provide affordable supplementary protection, especially during storage periods.
Placement throughout your RV creates a distributed moisture control network. Replace these products according to manufacturer guidelines, typically when visible crystals have dissolved or changed color. Some versions include activated charcoal to simultaneously control odors while absorbing moisture.
Ventilation Strategies
Strategic ventilation significantly reduces humidity buildup. Install and use roof vents with fans in bathroom and kitchen areas to expel moisture-laden air. Cracking windows on opposite sides of your RV creates cross-ventilation that efficiently exchanges humid interior air with drier outside air. This approach works particularly well in low-humidity weather conditions but should be avoided during rainy or extremely humid periods.
Consider installing vent covers that allow ventilation even during rainfall. Many RVers use specialized covers like MaxxAir products that permit ventilation while preventing water entry. For stored RVs, periodic ventilation, even in winter months on dry days, helps prevent moisture accumulation.
Insulation Improvements
Better insulation reduces condensation by minimizing temperature differentials between interior surfaces and air. Apply window insulation film during cold weather to prevent condensation on glass surfaces. Thermal curtains provide an additional barrier against cold windows, reducing the formation of condensation that contributes to overall humidity.
Address thermal bridges in your RV’s construction where possible. These areas of poor insulation create cold spots that promote condensation. Specially designed RV insulation products for skylights, vents, and windows can significantly reduce these problem areas. Some RVers use dehumidifier chips or fabric specifically near windows and exterior walls where condensation commonly forms.
Regular inspection and repair of weather stripping around doors and windows prevents moisture infiltration during rain. Combined with a small dehumidifier, these passive approaches create a comprehensive moisture management system tailored to your RV’s specific needs.