For most RVs, you should place a dehumidifier in a central, open part of the main living area. Keep it on a stable, level surface with enough clearance around the air intake and exhaust. If one room stays noticeably wetter, move the unit closer to that area while maintaining good airflow.
The right location can make a big difference in moisture removal. Below, I’ll show you where to place your dehumidifier, where not to put it, how to handle drainage, and how to confirm your chosen location actually works.
Key Takeaways
- A central living area is usually the best starting location.
- Keep the intake and exhaust completely clear of obstructions.
- Always follow your dehumidifier’s required clearance specifications.
- Place larger units on a hard, stable, level surface.
- Keep electrical dehumidifiers away from shower spray and standing water.
- Open interior doors when one unit serves several RV rooms.
- Use proper drainage if running the dehumidifier continuously.
- Don’t place large electric units inside closed cabinets or closets.
- Use separate hygrometers to check humidity throughout your RV.
- Move the unit if one area continues developing condensation.
Where Is the Best Place to Put a Dehumidifier in an RV?
For most RV owners, the main living area is the best location for one dehumidifier. Choose an open spot where air from several sections of the RV naturally circulates.
You don’t necessarily need to place the machine beside the wettest window. A dehumidifier works best when humid air can reach its intake easily.
In a typical travel trailer, that might mean the floor between the kitchen and living area. In a motorhome, it could be near the center aisle.
Your goal is to dry the largest useful volume of air.
If the bedroom door stays closed every night, however, central placement may not be enough. The same problem can happen with separate bunkhouses or rear bedrooms.
In that situation, improve circulation or reposition the dehumidifier closer to the problem area.
Think of central placement as your starting point rather than a permanent rule.
Best Dehumidifier Placement by RV Location
Different parts of an RV create different moisture conditions. Here’s a quick guide to choosing the most practical location.
| RV Location | Placement Recommendation | Best For | Main Caution |
| Main living area | Open, central floor area | Whole-RV humidity control | Keep intake and exhaust clear |
| Bedroom | Near doorway or open bedroom area | Overnight moisture | Consider compressor noise |
| Bathroom | Dry area outside the wet zone | Shower humidity | Avoid water and shower spray |
| Kitchen | Open area near the living space | Cooking moisture | Avoid heat and splashes |
| Hallway | Open spot connecting rooms | Divided floorplans | Don’t block walking space |
| Bunkhouse | Near the doorway | Closed rear rooms | Keep airflow between rooms |
| Closets | Use passive moisture absorbers | Small enclosed spaces | Don’t cram large units inside |
| RV storage | Central open location | Long-term humidity control | Plan safe continuous drainage |
The best choice depends on your RV layout. Airflow matters more than simply choosing the dampest room.
How to Choose the Right Spot Inside Your RV
Before plugging your dehumidifier in, look around your RV carefully. A good location should let the unit breathe while remaining stable and safe.
- Place it on a hard and level surface.
- Keep air intake openings completely unobstructed.
- Keep exhaust vents away from walls and furniture.
- Follow the clearance stated in the owner’s manual.
- Keep curtains away from the intake and exhaust.
- Avoid placing bedding against the machine.
- Make sure you can easily remove the water bucket.
- Leave enough room for filter cleaning.
- Keep electrical cords away from wet areas.
- Avoid locations where people frequently walk.
- Consider compressor noise near sleeping areas.
- Place the unit where nearby rooms can exchange air.
- Keep exterior doors closed during humid weather.
- Secure continuous drain hoses against accidental movement.
You may see recommendations suggesting six or twelve inches everywhere. I wouldn’t treat either measurement as a universal rule.
Different dehumidifiers require different clearances.
The manufacturer’s instructions should always take priority.
Should an RV Dehumidifier Be on the Floor or a Counter?
For most medium and full-size dehumidifiers, a hard, level RV floor is usually the better location. It provides greater stability and reduces the chance of the machine falling.
A floor location also makes heavy compressor units easier to handle.
Just make sure nearby furniture isn’t blocking the airflow.
A countertop can work well with smaller dehumidifiers. It can also make gravity drainage easier when the drain destination sits lower.
However, make sure your RV counter can support the machine safely. Road vibration and accidental bumps can move an unsecured appliance.
Don’t place a dehumidifier high simply because you think humid air rises. Likewise, don’t place it low because you believe moisture collects near the floor.
Humidity mixes throughout the interior as air moves.
Air circulation matters much more than the unit’s exact height.
Should You Put a Dehumidifier Near the Bathroom?
The bathroom produces some of the biggest moisture spikes inside an RV. However, placing an electrical appliance directly inside the wettest area isn’t always the safest solution.
Place It Outside the Bathroom for Whole-RV Control
A location near the bathroom doorway often works very well.
The dehumidifier can capture moisture leaving the bathroom while also treating air throughout the RV.
During a shower, use your bathroom exhaust fan whenever practical. Removing steam directly is much faster than asking the dehumidifier to handle everything.
After showering, continue ventilation until most visible steam disappears.
Then allow remaining moisture to circulate toward the dehumidifier.
This combination usually works better than relying entirely on one appliance.
Can You Put a Dehumidifier Inside the RV Shower?
I would avoid placing a standard powered dehumidifier inside a shower stall where water, splashes, or standing moisture can reach it.
You may see people recommending the shower as a convenient location. Usually, what makes sense is routing a drain hose toward the shower drain, not operating an electrical appliance in a wet enclosure.
Those are two very different setups.
Keep the dehumidifier somewhere dry and stable.
If you’re using continuous drainage, you may be able to route the hose toward an appropriate shower drain.
Always confirm that your dehumidifier supports continuous drainage first.
Where Should You Put a Dehumidifier in the RV Bedroom?
An RV bedroom can become surprisingly humid overnight.
Two sleeping adults release moisture simply through breathing. Cold exterior walls and windows can then collect that moisture as condensation.
For an open RV floorplan, keeping the dehumidifier centrally located may be enough.
If your bedroom stays wetter than the rest of the RV, place the unit closer to the bedroom doorway.
This lets it pull damp bedroom air while still serving nearby areas.
You can also place it inside the bedroom when necessary. Just maintain adequate clearance around the machine.
Keep bedding, curtains, blankets, and clothing away from its vents.
Noise is another factor worth considering.
A compressor-style dehumidifier can be noticeable while you’re sleeping. Moving it slightly outside the bedroom may provide a better balance between moisture control and comfort.
If the bedroom door stays closed all night, check humidity separately inside that room.
A living-room dehumidifier cannot effectively dry air trapped behind a closed door.
Where Should You Place It in a Kitchen or Main Living Area?
The main living area is usually my first choice for whole-RV moisture control.
It often sits between the kitchen, bathroom, and sleeping areas. That gives one dehumidifier access to air moving through several sections.
Look for an open floor location without nearby obstructions.
Don’t hide the unit behind a recliner simply because it looks better there. A blocked intake can significantly reduce performance.
The kitchen also creates temporary humidity spikes.
Boiling water, washing dishes, and cooking food all release moisture.
However, don’t place the dehumidifier directly beside your stove.
Heat, grease, and steam aren’t ideal for the machine.
Instead, use your range hood or roof vent while cooking. Let the dehumidifier handle the remaining background humidity afterward.
Also keep the unit away from sink splashes.
Placement Changes With Your RV Floorplan
A 20-foot travel trailer and a 40-foot fifth wheel don’t move air the same way. Your RV layout should influence where you place the dehumidifier.
Class B Camper Van
A Class B has a small and mostly connected interior.
Because there are fewer separate rooms, one compact dehumidifier can often serve most of the space.
Place it somewhere around the central galley or main aisle while parked.
Don’t create a tripping hazard in the narrow walkway.
Keep cabinet doors open occasionally if they feel damp inside.
Small Travel Trailer
One centrally placed unit is usually enough for a small travel trailer.
Try a position between the kitchen, bathroom, and sleeping area.
Keep interior doors open whenever practical.
If the bed sits against a cold exterior wall, periodically inspect nearby surfaces for condensation.
Class C Motorhome
A Class C often has several connected areas but also some unusual moisture zones.
The cab-over bed deserves particular attention because exterior surfaces can become cold overnight.
Start with the dehumidifier in the central living area.
Then monitor humidity around sleeping areas.
If the cab-over section remains damp, improve airflow toward that area.
Large Travel Trailer or Fifth Wheel
Large towable RVs need more careful placement.
A front bedroom, rear living room, or bunkhouse can become almost separate from the main cabin.
Start with one appropriately sized unit centrally.
Keep room doors open and allow air to move between sections.
If one distant room consistently remains humid, a circulation fan may help.
In some floorplans, two smaller dehumidifiers may work better than one larger unit.
Class A Motorhome
Class A motorhomes can have long interiors and multiple separated rooms.
A dehumidifier in the kitchen may work perfectly there but barely influence a rear bedroom.
Don’t assume one machine is controlling the entire motorhome.
Place hygrometers in both ends of the RV.
If humidity differs significantly, adjust airflow or consider separate units.
How to Set Up a Continuous Drain in an RV
Continuous drainage can make RV humidity control much easier. However, your dehumidifier location needs to work with the drainage system.
Gravity Drain to a Sink or Shower Drain
Many dehumidifiers allow water to flow through a drain hose instead of filling the internal bucket.
With gravity drainage, the hose normally needs to travel downward from the dehumidifier.
Avoid uphill sections.
Also avoid loops where water can collect.
Keep the hose supported and make sure it cannot pull loose.
Depending on your setup, you may route the hose toward an appropriate sink or shower drain.
Keep the electrical appliance itself away from the wet area.
Using a Dehumidifier With a Built-In Pump
A built-in condensate pump gives you more placement flexibility.
Instead of relying completely on gravity, the pump can push collected water toward a suitable drain.
This can help when the ideal dehumidifier location isn’t higher than your drain.
However, every pump has limitations.
Check the manufacturer’s instructions for maximum hose height and distance.
Make Sure the Drain Location Does Not Create Another Moisture Problem
A continuous drain is useful only when it remains secure.
Check the hose regularly for:
- Loose fittings
- Cracks
- Kinks
- Blockages
- Accidental disconnection
- Water backing up
A leaking drain hose can create exactly the moisture problem you’re trying to prevent.
Where Not to Put a Dehumidifier Inside an RV
Some locations reduce performance, while others can create genuine safety concerns.
- Don’t place it inside a wet shower stall.
- Don’t expose it to standing water.
- Don’t place it directly beside a shower spray zone.
- Don’t cram it tightly against an RV wall.
- Don’t put it inside a closed cabinet.
- Don’t hide it behind a sofa or recliner.
- Don’t cover the intake with curtains.
- Don’t let bedding touch the exhaust area.
- Don’t place it on a mattress or cushion.
- Don’t put a heavy unit on an unstable shelf.
- Don’t place it directly beside a furnace outlet.
- Don’t position it beneath an active water leak.
- Don’t run cords through wet bathroom areas.
- Don’t create a tripping hazard with drain hoses.
- Don’t block emergency exits or walkways.
- Don’t leave the unit unsecured while traveling.
Your dehumidifier should operate in a dry, stable location with unrestricted airflow.
Should Interior Doors, Cabinets, and Closets Stay Open?
If you’re using one dehumidifier for several RV rooms, airflow between those rooms becomes very important.
Keep bedroom and bunkhouse doors open when practical.
That lets humid air reach the machine.
Cabinets and wardrobes can create their own small moisture pockets. Opening them periodically allows drier cabin air to circulate inside.
You can also leave cabinet doors slightly open during storage.
However, don’t place a full-size powered dehumidifier inside a tiny cabinet.
There won’t be enough airflow around the appliance.
Passive moisture absorbers are generally more practical for small enclosed spaces.
Mattress areas deserve similar attention.
If your mattress sits directly on plywood, moisture can become trapped underneath. Improving under-mattress airflow may solve that local problem better than moving the dehumidifier beside the bed.
Should Windows and Roof Vents Be Open While the Dehumidifier Runs?
During hot and humid weather, keep exterior windows and doors mostly closed while actively dehumidifying.
Otherwise, you’re constantly introducing additional humid outdoor air.
That makes your machine work much harder.
Roof vents are slightly different.
When showering or cooking, use ventilation to remove large amounts of steam directly.
Once the moisture source stops, close unnecessary exterior openings if outdoor humidity remains high.
Think of your exhaust fan and dehumidifier as two different tools.
The exhaust fan removes concentrated moisture quickly.
The dehumidifier manages the remaining humidity throughout the RV.
Using both properly usually works better than choosing only one.
How to Tell Whether Your Dehumidifier Is in the Right Place
You don’t have to guess whether your chosen location works. A few humidity measurements can tell you exactly what’s happening.
Use a Separate Hygrometer
A small digital hygrometer is one of the most useful moisture-control tools you can keep inside an RV.
Don’t rely entirely on the dehumidifier’s built-in humidity reading.
The machine measures air very close to itself.
That doesn’t necessarily represent the whole RV.
Place a separate hygrometer several feet away.
Avoid putting it directly beside:
- The dehumidifier exhaust
- An AC vent
- A furnace outlet
- A sunny window
- The bathroom shower
You want a representative room reading.
Check More Than One Area of the RV
Larger RVs can have very different humidity levels from one end to another.
If possible, check:
- Main living area
- Bedroom
- Bathroom area
- Bunkhouse
- Cab-over sleeping section
You don’t necessarily need expensive equipment.
Several inexpensive digital hygrometers can quickly reveal moisture differences.
For example, your living area might read 44% RH while the bedroom remains at 61%.
That tells you airflow or placement needs attention.
Aim for a Useful Humidity Range
For most RV interiors, keeping relative humidity around 30% to 50% is a sensible target.
You don’t need to make your RV extremely dry.
The goal is simply to prevent prolonged damp conditions and condensation.
Around 40% to 50% RH works comfortably for many situations.
Cold-weather camping may require more careful monitoring because cold surfaces can develop condensation even when the room doesn’t feel particularly humid.
Move the Unit If One Zone Stays Damp
Give your current placement enough time to influence the interior.
Then compare readings.
If the living area becomes dry while the bedroom remains humid, try improving circulation first.
Open the door.
Use a small circulation fan.
Move the dehumidifier slightly toward that room.
If the problem continues, the room may need its own smaller unit.
This approach is much better than constantly moving the machine based on where you happen to see water.
One Dehumidifier or Two for a Large RV?
You shouldn’t decide based on RV length alone.
The floorplan matters just as much.
One appropriately sized dehumidifier may easily serve a 30-foot RV with an open layout.
Meanwhile, a shorter RV with closed bedrooms could have more difficulty.
Start with one properly sized unit whenever practical.
Monitor humidity in different areas.
If the readings remain reasonably consistent, there’s little reason to add another machine.
Two units become more useful when you have:
- A closed front bedroom
- A separate bunkhouse
- A rear bedroom
- Long interior distances
- Doors that remain closed
- Persistent humidity differences between rooms
Don’t add another dehumidifier simply because your RV is large.
Let actual humidity readings guide your decision.
Does Dehumidifier Placement Change in Summer and Winter?
Seasonal conditions change where moisture collects inside an RV. Your best placement may therefore change throughout the year.
Hot and Humid Summer Camping
During humid summer weather, start with the dehumidifier in your central living area.
Run your air conditioner when appropriate.
Keep unnecessary exterior openings closed during active dehumidification.
Pay attention to moisture around bathrooms and kitchens.
Use exhaust ventilation immediately after showers and while cooking.
Then let your dehumidifier manage the remaining moisture.
Cold-Weather Camping
Cold-weather condensation behaves differently.
Warm interior air touches cold windows, walls, and bed platforms.
Water can then form on those surfaces.
Watch areas around:
- Windows
- Exterior walls
- Mattresses
- Closets
- Cab-over beds
- Slide-out walls
A centrally located dehumidifier may still work well.
However, you may need better airflow toward these cold surfaces.
Also check your machine’s minimum operating temperature.
Some compressor dehumidifiers become less effective when the surrounding air gets too cold.
RV Storage
If your stored RV has reliable electrical power, central placement usually makes sense.
Open interior room and cabinet doors so air can circulate.
Arrange reliable drainage if the machine will run for extended periods.
Make sure the drain hose cannot disconnect.
Also follow any manufacturer requirements about unattended operation.
If your storage location has no electricity, passive moisture absorbers may help inside closets and cabinets.
They shouldn’t be expected to perform like a powered dehumidifier.
Common RV Dehumidifier Placement Mistakes
A few placement mistakes can make a perfectly good dehumidifier seem ineffective.
- Putting the unit in the bathroom simply because it’s humid.
- Operating a powered unit inside a wet shower enclosure.
- Assuming every dehumidifier needs exactly 12 inches of clearance.
- Blocking the rear intake against an RV wall.
- Letting curtains cover the exhaust.
- Hiding the machine behind furniture.
- Keeping bedroom doors closed during whole-RV drying.
- Putting large units inside small closets.
- Using unstable countertops for heavy machines.
- Running gravity drain hoses uphill.
- Allowing drain hoses to kink.
- Placing hygrometers beside the dehumidifier outlet.
- Leaving windows open during very humid weather.
- Expecting one unit to reach sealed rooms.
- Trying to dry an active water leak with a dehumidifier.
That last mistake deserves extra attention.
A dehumidifier can reduce humidity after moisture enters your RV.
It cannot repair a leaking roof, plumbing connection, window seal, or slide.
If one area keeps becoming wet despite reasonable humidity levels, inspect it for water intrusion.
A Simple RV Dehumidifier Placement Checklist
Before turning your unit on, run through this quick checklist.
- Is the machine sitting level?
- Is the surface stable?
- Is the location completely dry?
- Is the intake unobstructed?
- Is the exhaust unobstructed?
- Does it meet manufacturer clearance requirements?
- Are curtains kept away?
- Is bedding safely separated?
- Can nearby rooms exchange air?
- Can you remove the water bucket easily?
- Can you reach the filter?
- Is the drain hose secure?
- Does a gravity hose slope downward?
- Is the power cord away from water?
- Is the machine outside the main walking path?
- Is your hygrometer positioned elsewhere?
If you can answer yes to those questions, you’ve probably chosen a good location.
Final Words
For most RV owners, the best place to start is a central, open section of the main living area.
Place your dehumidifier on a stable surface, keep its airflow unrestricted, and follow its required clearance guidelines.
Then check humidity throughout the RV.
If one bedroom or bunkhouse stays noticeably wetter, improve airflow or move the unit closer.
You don’t need to chase every drop of condensation.
Instead, focus on keeping the entire interior within a healthy humidity range.
The best RV dehumidifier location is ultimately the spot that combines good airflow, safe electrical placement, reliable drainage, and consistent humidity control.
Related FAQs
Where Is the Best Place to Put a Dehumidifier in an RV?
The best place is usually a central, open part of the main living area. Choose a stable surface with good airflow and enough clearance around the intake and exhaust.
Should an RV Dehumidifier Be High or Low?
Most RV dehumidifiers work well on a hard, level floor. Height matters less than good airflow, stability, proper clearance, and safe access to drainage.
Can I Put a Dehumidifier in My RV Bathroom?
You can place one near the bathroom, but keep it somewhere dry and away from shower spray, standing water, and other wet surfaces.
Can I Put a Dehumidifier in the RV Shower?
Avoid operating a standard powered dehumidifier inside a wet shower enclosure. You may instead route an approved continuous drain hose toward the shower drain.
How Far Should a Dehumidifier Be From the Wall?
Follow your dehumidifier manufacturer’s clearance requirements because they vary by model. The intake and exhaust should always remain completely unobstructed.
Can One Dehumidifier Handle an Entire RV?
One properly sized unit can handle many small or open-layout RVs. Large rigs with closed bedrooms or bunkhouses may require better circulation or another unit.
Should I Leave RV Doors Open When Running a Dehumidifier?
Yes, leaving interior doors open helps one dehumidifier treat several rooms. Closed bedroom or bunkhouse doors can trap humid air away from the machine.
Should RV Windows Be Open With a Dehumidifier Running?
Usually keep windows closed during humid weather so outside moisture doesn’t continuously enter. Use roof or exhaust fans temporarily while showering and cooking.
Can I Drain an RV Dehumidifier Into the Shower?
Many continuous-drain setups can route a hose toward an appropriate shower drain. Keep the electrical appliance itself dry and follow the manufacturer’s drainage instructions.
Where Should I Put a Dehumidifier in a Fifth Wheel?
Start in the central living area where air can move throughout the fifth wheel. Monitor separate bedrooms because longer floorplans can develop isolated humidity zones.
Where Should I Put a Dehumidifier During RV Storage?
Place it in an open central area and leave interior doors and cabinets open. If using continuous drainage, make sure the hose remains secure and reliable.
Should I Move My RV Dehumidifier From Room to Room?
Usually, you should first find one central location that controls most of the RV. Move the unit only when humidity readings show one area consistently stays wetter.
Can I Run an RV Dehumidifier Overnight?
Yes, many dehumidifiers can operate overnight when used according to their instructions. Make sure the unit is stable, ventilated, properly drained, and electrically safe.
What Humidity Should I Maintain Inside My RV?
Aim for roughly 30% to 50% relative humidity when practical. Keeping humidity controlled helps reduce condensation, musty odors, mold risk, and moisture damage.
Kevin Thompson documents RV travel lessons, planning tips, and gear reviews drawn from hands-on use. His writing is practical, direct, and easy to follow. Readers rely on his notes to make smarter RV buying and travel decisions.
