- Flat or 1–2 bedrooms: a 10–12 litre compressor dehumidifier is usually enough.
- 3–4 bedroom house: go for 20 litres, especially if you dry washing indoors.
- Large homes or serious damp: 25 litres, or a “smart” model that runs itself.
- Cold rooms, garages, boats: choose a desiccant dehumidifier – it keeps working near freezing.
Every autumn, millions of UK homes start to see the same signs: water running down the windows in the morning, a musty smell in the bedroom, black spots appearing in the corners of the bathroom. Our wet climate, well-sealed modern homes and drying washing indoors all push humidity up – and a good dehumidifier is the simplest way to bring it back down.
This guide explains how dehumidifiers work, what size you need, and which features are worth paying for, so you can choose with confidence.
Why UK homes get damp in winter
Warm indoor air holds moisture from cooking, showers, breathing and – the big one – drying clothes on radiators or airers. When that warm, moist air touches a cold surface like a window or an outside wall, it condenses into water. Over time, that moisture encourages mould, damages paint and plaster and makes rooms feel cold and clammy.
Opening windows and using extractor fans helps, but in the colder months most people keep windows shut. A dehumidifier removes the excess moisture continuously, so condensation has nowhere to come from.
Compressor or desiccant?
| Type | How it works | Best for |
|---|---|---|
| Compressor | Cools air over a cold coil so moisture condenses, like a fridge. | Most heated homes. Very efficient in normal room temperatures. |
| Desiccant | Draws air through a moisture-absorbing material, then releases the water. | Cold spaces – unheated rooms, garages, conservatories, boats. Also gives off a little warmth. |
If your home is heated through winter, a compressor model is usually the right choice. If you need to dry a cold room or a garage, a desiccant model such as the Meaco DD8L Pro, which works from just 1°C, will perform better.
What size dehumidifier do I need?
Dehumidifiers are rated by how many litres of water they can remove per day in test conditions. As a rough guide:
| Home size | Suggested capacity |
|---|---|
| Single room, studio or 1–2 bed flat | 10–12 litres |
| 2–3 bedroom home | 12–20 litres |
| 3–5 bedroom home, or drying lots of washing | 20–25 litres |
| Building work, leaks, plaster drying | Semi-professional unit |
If you’re between two sizes, go up. A larger unit reaches your target humidity faster and then simply switches off, so it doesn’t necessarily cost more to run.
Features worth paying for
- Laundry mode – runs at higher airflow to dry clothes indoors faster. Great if you don’t have a tumble dryer.
- Humidistat or smart control – lets the machine switch on and off automatically to hold a target humidity (around 50–60% is a common choice).
- Low noise – look for figures below 40dB if it will run in a bedroom.
- Continuous drainage – connect a hose so you never need to empty the tank.
- HEPA filter – some models double as air purifiers, capturing dust and allergens too.
Our picks
Tips to get the best results
- Place it in the dampest room, or near where you dry clothes, with space around it for airflow.
- Keep internal doors closed while drying washing so the unit works on one room.
- Clean the dust filter regularly – it keeps performance and efficiency high.
- Combine with short bursts of ventilation after showers and cooking.
Frequently asked questions
How long should I run a dehumidifier each day?
Will a dehumidifier get rid of mould?
Is a dehumidifier expensive to run?
Browse our full range of dehumidifiers – all with free UK delivery, 30-day free returns and a 12-month warranty.