Comparison Guide
Desiccant vs Compressor Dehumidifier — Which Is Better for UK Homes?
Updated June 2026
Walk into any UK dehumidifier thread on Reddit or Mumsnet and you'll see the same debate: compressor or desiccant? The short answer: compressor dehumidifiers are cheaper to run in heated rooms. Desiccant dehumidifiers work better in cold, unheated spaces. But the full picture is more nuanced — and choosing the wrong type means wasting electricity or getting no results. Here's everything you need to know.
Quick answer
Compressor if your room is heated above 15°C (bedrooms, living rooms, kitchens). Desiccant if your room is cold and unheated (spare rooms, garages, conservatories, caravans). In a typical UK flat with central heating, a compressor is the right choice 90% of the time.
Side-by-side comparison
| Feature | Compressor | Desiccant |
|---|---|---|
| How it works | Refrigerant cools air, moisture condenses on cold coils | Absorbent material (zeolite) soaks up moisture, heat regenerates it |
| Best temperature range | 15°C–35°C | 1°C–40°C |
| Performance below 15°C | Drops significantly, may ice up | Full performance even near freezing |
| Running cost (typical) | 3–7p per hour | 8–15p per hour |
| Typical wattage | 150–450W | 350–600W |
| Noise level | Low hum (38–45dB) | Quieter (35–40dB) |
| Weight | Heavier (10–14kg) | Lighter (6–8kg) |
| Heat output | Slight warming (1–2°C) | Noticeable warming (3–5°C) |
| Water collection | Tank + continuous drain option | Tank only (usually) |
| Typical price | £80–£250 | £120–£200 |
| Best for UK use | Heated bedrooms, living rooms, flats | Unheated spare rooms, garages, conservatories, boats |
Compressor
Refrigerant cools air, moisture condenses on cold coils
Desiccant
Absorbent material (zeolite) soaks up moisture, heat regenerates it
Compressor
15°C–35°C
Desiccant
1°C–40°C
Compressor
Drops significantly, may ice up
Desiccant
Full performance even near freezing
Compressor
3–7p per hour
Desiccant
8–15p per hour
Compressor
150–450W
Desiccant
350–600W
Compressor
Low hum (38–45dB)
Desiccant
Quieter (35–40dB)
Compressor
Heavier (10–14kg)
Desiccant
Lighter (6–8kg)
Compressor
Slight warming (1–2°C)
Desiccant
Noticeable warming (3–5°C)
Compressor
Tank + continuous drain option
Desiccant
Tank only (usually)
Compressor
£80–£250
Desiccant
£120–£200
Compressor
Heated bedrooms, living rooms, flats
Desiccant
Unheated spare rooms, garages, conservatories, boats
How compressor dehumidifiers work
A compressor dehumidifier works like a mini fridge in reverse. A fan draws humid air over refrigerant-cooled coils. The moisture condenses on the cold coils and drips into a collection tank. The dry air passes over warm coils and returns to the room slightly warmer.
This process is very energy efficient in rooms above 15°C — the compressor cycles on and off as needed, only running when humidity rises above your target.
Below 15°C, the coils can ice up and the unit must defrost, dramatically reducing performance. That's the reason a compressor designed for a warm flat will sit and struggle in an unheated garage.
How desiccant dehumidifiers work
A desiccant dehumidifier uses an absorbent material (usually zeolite) on a slowly rotating wheel. As humid air passes through, the zeolite absorbs the moisture. A separate heater then regenerates the zeolite, releasing the captured moisture into a collection tank.
Because there are no cold coils, there is no icing problem — desiccant units work at any temperature, even near freezing.
The trade-off: the internal heater uses more electricity. However, this heater also warms the output air by 3–5°C, which can be a benefit in cold rooms.
Running costs compared
Compressor (200W typical)
- Cost per hour: 4.9p
- 6 hours/day for 30 days: £8.82
- Real world (with thermostat cycling): ~£5–£7/month
Desiccant (500W typical)
- Cost per hour: 12.3p
- 6 hours/day for 30 days: £22.14
- Real world (with thermostat cycling): ~£15–£20/month
A compressor costs roughly half as much to run. But in a cold room below 15°C, a compressor extracts almost nothing while a desiccant continues working. Paying 12p/hour for a working dehumidifier beats paying 5p/hour for one that's just defrosting.
For detailed running costs of specific models, see our dehumidifier running cost guide.
Our top pick: Compressor
MeacoDry Arete Two 12L
Our #1 overall recommended dehumidifier. 2-in-1 compressor dehumidifier + HEPA air purifier. 38dB quiet, Wi-Fi app control, laundry mode. Running cost approximately 4p/hour.
Check Price on Amazon UK →Our top pick: Desiccant
EcoAir DD1 Classic MK6
The best desiccant dehumidifier for cold UK rooms. Works down to 1°C. Lightweight at just 6kg. Built-in ioniser and antibacterial silver filter. Ideal for unheated spare bedrooms, garages and conservatories.
Check Price on Amazon UK →Which one do YOU need? Quick decision guide
Your room has central heating and stays above 15°C
→ Compressor
Cheaper to run, more efficient. Get the MeacoDry Arete Two.
Buy MeacoDry on Amazon →Your room is unheated and drops below 15°C in winter
→ Desiccant
The only type that works properly in the cold. Get the EcoAir DD1.
Buy EcoAir on Amazon →You're not sure — sometimes heated, sometimes not
→ Compressor with auto-defrost
The MeacoDry handles occasional cold dips with its defrost cycle.
Buy MeacoDry on Amazon →You want the lightest, most portable option
→ Desiccant
At 6kg vs 12kg, desiccant wins for moving between rooms.
Buy EcoAir on Amazon →You want the cheapest running cost
→ Compressor
Half the electricity cost of desiccant in heated rooms.
Buy MeacoDry on Amazon →You want the quietest option
→ Desiccant
Slightly quieter, and no compressor vibration.
Buy EcoAir on Amazon →Common myths debunked
Myth: "Desiccant dehumidifiers are always better because they work at any temperature"
Reality: In a heated UK flat, a compressor extracts the same amount of moisture at roughly half the running cost.
Myth: "Compressor dehumidifiers don't work in winter"
Reality: They work fine in any room above 15°C. Most UK bedrooms and living rooms are heated well above this.
Myth: "I need a desiccant because my home is damp"
Reality: How damp your home is doesn't determine the type — room temperature does. A very damp but heated room needs a compressor.
Frequently asked questions
Can I use a compressor dehumidifier in a garage?
Only if the garage stays above 10–15°C. In an unheated UK garage in winter, a desiccant is the only option that works reliably.
Why does my compressor dehumidifier keep icing up?
The room is too cold. Below 15°C, moisture freezes on the coils. Auto-defrost helps but extraction drops dramatically. Switch to a desiccant if the room can't be kept warmer.
Do desiccant dehumidifiers heat the room?
Yes — the exhaust air is 3–5°C warmer. In a cold spare room, this is a benefit. In a warm bedroom, it can make the room feel stuffy.
Which type is better for drying clothes?
Both work. A compressor is cheaper to run with laundry mode. A desiccant warms the air, which helps clothes dry faster in a cold room.
Can I use both types in the same home?
Yes. Many UK homeowners run a compressor in the heated living room or bedroom and a desiccant in an unheated spare room or conservatory.