Best RV Dehumidifiers: Picks by Type for Campers, Vans and Motorhomes

RVs trap moisture. Cooking, showers, breathing, and wet gear all add humidity to a small, tightly sealed space, and in cooler weather that moisture condenses on windows and walls. Left alone, it can lead to mold, musty smells and water damage.

A dehumidifier helps, but the right type depends on your RV’s size, your power setup and whether you’re dealing with a closet or the whole coach. This guide explains the options and suggests a few well-known picks for each.

Key Takeaways

• RVs trap moisture from cooking, showers and breathing; left alone it causes mold, musty smells and window condensation.
• Pick a dehumidifier type by space and power: renewable/desiccant for closets and off-grid, compressor (refrigerant) for whole-coach in warm, humid weather.
• Pair it with ventilation and moisture absorbers to cut humidity further.
• Match capacity to your RV’s size and electrical setup.

Types of RV Dehumidifiers

Type	Best for	Pros	Cons
Moisture absorber (e.g., calcium chloride tubs)	Closets, cabinets, storage	No power needed, cheap	Must be replaced; can spill
Rechargeable desiccant (e.g., Eva-Dry)	Closets and small spaces	No cords while working; reusable	Very low capacity; needs recharging
Thermoelectric (Peltier)	Vans and small trailers	Quiet, light, low power draw	Removes little water; weak in cool temps
Compressor	Large RVs, humid climates, full-timers	Removes by far the most water	Heavier, louder, draws more power

Our Picks by Type

We chose these based on widely available product specs and independent review coverage, including RTINGS and Family Handyman. We haven’t lab-tested them ourselves, and product specs change, so check the current listing before you buy.

1. Best Mini Electric Dehumidifier: Pro Breeze

Pro Breeze’s mini thermoelectric dehumidifier is a common pick for small spaces. RTINGS names a Pro Breeze model as its top small dehumidifier. It’s light (about 2.4 lb), quiet, and shuts off automatically when the 16-oz tank is full, which makes it a good fit for a small trailer’s bedroom or bathroom.

Keep in mind: Thermoelectric units remove only a small amount of water per day and work best in warm rooms. They won’t keep up with a large RV in a humid climate.

2. Best for Closets and Cabinets: Eva-Dry E-333

The Eva-Dry E-333 is a small rechargeable desiccant unit. It absorbs moisture without power, then you plug it in to dry it out and reuse it. An indicator shows when it needs recharging. It’s best for enclosed spaces like wardrobes and storage bays.

3. Best No-Power Option: Camco Moisture Absorber

Disposable moisture absorbers are an easy way to protect an RV in storage, when you may not have power. Place a few around the coach and replace them when they fill up. Keep them on a flat surface and away from kids and pets, since the collected liquid is a salty brine.

4. Best for Mid-Size Rooms: Ivation Thermoelectric

Ivation’s larger thermoelectric model has a bigger tank and an adjustable humidistat, which makes it a step up from mini units for a small travel trailer. It’s still quieter and lighter than a compressor dehumidifier, but it shares the same limits in cool, very humid conditions.

5. Best for Large RVs and Full-Timers: Compressor Dehumidifier

If you live in your RV, camp in humid regions, or have a large fifth wheel or motorhome, a compressor dehumidifier is the only type that removes enough water. Full-size models like this hOmeLabs Energy Star unit are made for homes, so check the dimensions, weight and power draw before you buy. Many have a hose connection so you can drain directly into a sink or shower instead of emptying a bucket.

How to Choose an RV Dehumidifier

Size

Match the unit to the space you need to dry. A mini unit is fine for a closet or a small trailer, but a 35–40 foot RV in a humid area needs a compressor dehumidifier.

Power use

Thermoelectric minis draw little power and can run on a modest inverter. Compressor units draw more, so plan to run them on shore power or a properly sized generator.

Auto shut-off and humidistat

An automatic shut-off prevents overflow when the tank is full. A built-in humidistat lets the unit cycle on and off to hold a set humidity level, which saves power.

Continuous drain

For long stays, a drain hose outlet saves you from emptying the tank several times a day.

Noise

Thermoelectric units are quiet enough for a bedroom. Compressor units sound more like a small air conditioner.

Other Ways to Reduce Humidity in Your RV

• Use the bathroom and kitchen vent fans when showering and cooking. A powered roof vent fan helps a lot.
• Crack a window or vent slightly, even in cool weather, to let moist air escape.
• Cook with lids on pots, and consider an electric pressure cooker or cooking outside.
• Dry wet gear outside or in a vented area instead of inside the coach.
• Run the air conditioner in warm, humid weather. It removes moisture as it cools.
• Avoid unvented propane heaters, which add moisture. See our guide on catalytic heaters.

Frequently Asked Questions

What humidity level should I keep in my RV?

Most guidance recommends keeping indoor humidity roughly between 30% and 50% to limit mold growth and condensation. A cheap digital hygrometer makes it easy to check.

Do I need a dehumidifier in my RV in winter?

Often, yes. Cold outside walls and windows make condensation worse in winter, especially when you’re living in the RV. See our guide to RV living in winter.

Can I leave a dehumidifier running in a stored RV?

Only if it has auto shut-off or a continuous drain and you have reliable power. For unattended storage, many owners use moisture absorbers instead.