How much does a dehumidifier cost to run?
A compressor dehumidifier typically costs about 4.9p to 5.5p an hour to run, or 39p to 44p for an 8-hour day, on the Ofgem price cap for 1 October to 31 December 2026.
Typical running costs
Typical power from real UK listings, costed at 26.32p per kWh.
| Type | Typical power | Per hour | For an 8-hour day |
|---|---|---|---|
| Compressor (10 to 12 litres a day) | 187 to 210W | 4.9p to 5.5p | 39p to 44p |
| Desiccant | 300 to 580W | 7.9p to 15p | 63p to £1.22 |
Most dehumidifiers switch off once the room reaches the humidity you set, so real running time is often shorter. Desiccant models suit cold rooms and garages but use more power.
Work out your own
- Per day
- 44p
- Per week
- £3.10
- Per year
- £160.95
Watts ÷ 1,000 × hours × pence per kWh.
How these figures are worked out
Cost per hour is the power in watts, divided by 1,000, times the unit rate. The rate is the Ofgem price cap, 1 October to 31 December 2026 (direct debit, average, VAT removed). Your own tariff may differ, so check the unit rate on your bill.
Typical power comes from these UK listings: