Desiccant vs Compressor Dehumidifier: Which Type Do You Need?
By Priya Shah, reviewed by James Whitfield · Updated
The two main types of home dehumidifier work in completely different ways, and choosing the wrong one is the most common reason people are disappointed with their purchase. Here is how a compressor and a desiccant model differ, where each one wins, and a simple rule for choosing.
The one-line difference
A compressor dehumidifier cools the air over a cold coil so water condenses and drips into the tank, like a fridge. A desiccant dehumidifier passes air over a moisture-absorbing material on a rotating wheel, then heats that wheel to release the water as vapour that is condensed. Compressor models are efficient in warm, humid rooms. Desiccant models keep working in the cold.
| Compressor | Desiccant | |
|---|---|---|
| How it works | Cold coil condenses water | Absorbent rotor, heated to release water |
| Best temperature | Above about 10 to 15°C | Works well down to near freezing |
| Energy use per litre | Lower in a warm room | Higher in a warm room |
| Noise | Compressor and fan hum | Quieter on many models, steady fan |
| Heat output | Slight warming | Noticeably warm air |
| Typical use | Living rooms, bedrooms, laundry | Garages, cellars, cold rooms, vans |
When a compressor model is the right choice
In a normal heated UK home, a compressor dehumidifier is the sensible default. It removes more water for each unit of electricity, it is widely available in capacities from 10L to 30L a day, and the Meaco Arete Two, Pro Breeze 20L OmniDry and De'Longhi Tasciugo AriaDry are typical examples. Use one for bedrooms, living rooms and drying washing indoors. See our best dehumidifier for the UK ranking for the full list.
When a desiccant model is the right choice
Below roughly 10 to 15°C the coil in a compressor unit gets too cold to work well and can ice up, so extraction drops sharply. A desiccant unit does not rely on a cold coil, so it keeps removing moisture in an unheated garage, a cold conservatory, a boat or a holiday home left empty over winter. The Meaco DD8L and EcoAir DD1 Simple MK3 are the desiccant models we cover. Be aware that the rated capacity of a desiccant unit is usually quoted at low temperature, so do not compare its litres-per-day figure directly with a compressor model rated at 30°C.
Running cost and noise
Desiccant units draw more power, because heating the rotor takes energy: for example, the EcoAir lists 300W on low and 580W on high, while a compressor model such as the De'Longhi lists 284W. The warm air they give out is a small bonus in a cold room and a nuisance in a warm one. For the full calculation, see our dehumidifier running cost guide. Noise is model-specific, so check the dB(A) rating rather than assuming either type is quieter.
What about a Peltier mini dehumidifier?
A third, smaller type uses a thermoelectric Peltier plate. It is silent and very low power but removes only a few hundred millilitres a day, so it suits a wardrobe or a caravan, not a room. The Pro Breeze 500ml is a typical mini model, and our small dehumidifier pillar compares them.
A simple decision rule
Ask where the unit will live. If the room is heated and lived in, choose a compressor model. If the space is cold, unheated or only visited occasionally, choose a desiccant model. If you need a bit of both, pick the type that suits the coldest place you will use it, because that is where the wrong choice fails. Also check the extraction rate against the room size: our how long does a dehumidifier take to work guide shows how capacity affects speed.
Further reading
For general UK consumer advice, Which? has a dehumidifier guide, and the GOV.UK guidance on damp and mould explains why treating the cause of damp matters as well as the air.
Ready to compare models? See our best dehumidifier uk comparison →
Frequently asked questions
Which is better, desiccant or compressor?+
Neither is better in every case. A compressor model is more efficient in a warm, heated room. A desiccant model keeps working in the cold, so it is better for garages, cellars and unheated spaces.
Do desiccant dehumidifiers work in winter?+
Yes. Because they do not rely on a cold coil, they keep extracting moisture at low temperatures where a compressor model would struggle or ice up.
Are desiccant dehumidifiers more expensive to run?+
In a warm room, yes, because they draw more power per litre removed. In a cold space, a compressor unit may remove so little water that the desiccant model is the better value.
What temperature does a compressor dehumidifier stop working?+
There is no sharp cut-off, but efficiency falls steeply below about 10 to 15°C and the coil can frost over. Many models have a defrost function that pauses extraction.
Which type is quieter?+
It depends on the individual model. Always compare the dB(A) rating on the lowest setting rather than relying on the type.