Winter Proofing Your Motorhome

The Ultimate Guide to Motorhome Dehumidifiers

As the season changes and many of us look to lay up our motorhomes for the winter, the battle against damp begins. We all know the dreaded smell of a musty van or the sinking feeling of finding mildew on the upholstery in spring.

While ventilation is key, a small dehumidifier can be the single best investment you make to protect your pride and joy during those cold, wet months. But how do they work, and which one should you choose? Let’s dive in.

How Do Small Dehumidifiers Work?

To choose the right unit, it helps to understand that not all dehumidifiers work the same way. For motorhomes, you will generally encounter three main types:

1. Peltier (Thermoelectric)

These are the very small, lightweight units often found on Amazon. They work by pulling air over a cold metal plate. The moisture condenses on the plate and drips into a tank.

The Catch: They rely on a temperature difference to work. If your motorhome is cold (below 15°C), they extract very little moisture.

2. Desiccant

These use a wheel made of water-absorbing material (like a sponge) to soak up moisture from the air. A heater then warms the wheel to release the water into the tank.

The Benefit: Because they use heat, they work efficiently even in temperatures as low as 1°C. They also blow warm air out, which can help keep the chill off your van's interior.

3. Compressor

These work like a fridge, using refrigerant coils to create a cold surface. They are powerful and energy-efficient in warm homes (20°C+) but often struggle in unheated motorhomes during winter, spending much of their time in "defrost mode" rather than drying the air.

Benefits of Using a Dehumidifier During Winter Storage

Leaving a dehumidifier running (assuming you have access to mains hook-up) offers massive advantages:

Prevents Mould & Mildew: By keeping relative humidity below 60%, mould spores cannot grow. This saves your upholstery, curtains, and mattresses from those unsightly black spots.
Protects Electronics: High humidity can lead to corrosion on sensitive electrical contacts and circuit boards within the dashboard and control panels.
Eliminates Odours: That "stale winter smell" is actually caused by damp and bacteria. A dry van smells fresh when you open the door in March.
Preserves Resale Value: A van that is dry and mould-free retains its value significantly better than one with water-stained walls or mildew damage.
Ready to Go: There’s no need to air out the van for days before your first trip; bedding feels dry and crisp immediately.

Pros and Cons of Motorhome Dehumidifiers

Before you buy, weigh up these factors:

Pros

Active Protection: Actively removes moisture rather than just trapping a small amount like passive crystals.
Heat Generation (Desiccant): Desiccant models add a few degrees of warmth to the interior, reducing frost risk.
Continuous Drainage: Most models allow you to attach a hose that drains directly into your sink or shower tray (leave the grey waste open!), so you don't have to visit the van weekly to empty the tank.
Healthier Environment: Reduces dust mites and allergens for the next season.

Cons

Requires Power: You need a reliable 230V hook-up. They will not run off your 12V leisure battery for long without draining it flat.
Running Costs: While efficient, they do add to your electricity bill. Desiccant models use slightly more power than compressor ones.
Monitoring Required: Unless you set up continuous drainage, you must visit the van to empty the tank, or the unit will auto-shutoff and stop working.
Noise: Not an issue for storage, but if you plan to sleep in the van with it on, fan noise can be noticeable.

Top 3 Small Dehumidifiers on Amazon for Motorhomes

(All links are for Amazon. I earn a small commission for each sale, but the cost to you is the same.)

Here are three distinct options found on Amazon that suit different motorhome needs:

1. The Winter Warrior: EcoAir DD1 Simple (Desiccant)

Best for: Unheated winter storage in the UK.
Why it works: This is widely considered the "gold standard" for motorhome storage. Because it is a desiccant model, it doesn't care if it's freezing outside; it will keep extracting moisture down to 1°C. It’s compact, lightweight (6kg), and powerful (extracts up to 7.5 Litres/day).
Key Feature: It has a rotary dial humidistat, so you can set it to a specific level and it will turn itself on and off automatically to maintain that level, saving energy.

2. The All-Rounder: MeacoDry ABC 12L Ultra Quiet with Laundry Mode

Best for: Motorhomes that are kept heated or used occasionally in winter.
Why it works: Effective at air drying wet laundry. Uses considerably less electricity than tumble dryers. Dedicated laundry mode runs for six hours before switching itself off to save energy. Awarded Quiet Mark for low noise (just 35dB).
Benefits: The perfect dehumidifier for a flat or smaller sized house. Use in the bedroom, living room, hallway, bathroom, kitchen, conservatory, cellar, garage. Removes condensation, takes the chill out of the air, prevents damp walls, damp smells and mould. Removes up to 12L of water per day.

3. The Budget/Compact Choice: Pro Breeze® 500ml Premium Dehumidifier

Best for: Very small spaces (wardrobes/cupboards) or mild storage conditions.
Why it works: You will see this tiny white and purple unit everywhere on Amazon. It is very cheap and draws tiny amounts of power (around 21–23 Watts). It is small enough to sit on a kitchen counter or inside a wardrobe to keep the edge off a specific damp-prone area.
Warning: Do not expect this to dry a damp 7-meter motorhome in December. It lacks the power to handle large volumes of air in cold temperatures.

Bonus Tip for Non-Electric Storage

If you don't have shore power at your storage yard, electric dehumidifiers aren't an option. In this case, look for the [suspicious link removed] on Amazon. It uses replaceable salt tabs to absorb moisture. While not as powerful as a machine, it is silent, requires no power, and is far better than nothing!

What kind of setup do you use to keep your motorhome dry over the winter months? Let me know in the comments below!

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Thank you so much!

If you’re looking for more tips, honest gear reviews, or just a place to share your latest trip photos, come and join the conversation! You can catch me over on my YouTube channel Johnny Burr , or join one of our active Facebook groups, Motorhome Touring Scotland and Motorhome Touring The UK andEurope. We’ve also got a buzzing community over on our Motorhome Touring Discord server, where we share real-time updates and advice. And of course, keep an eye and an ear out for my content on Caravan Radio. Let’s get out there and enjoy the journey together!

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Monday, September 21, 2026