How Much Does A Dehumidifier Cost Overnight?
Reference table
| Scenario | Power | Use time | Cost at 24.67p/kWh |
|---|---|---|---|
| 200W overnight | 200W | 8 hours | 39.47p |
| 300W overnight | 300W | 8 hours | 59.21p |
| 500W overnight | 500W | 8 hours | 98.68p |
| 650W overnight | 650W | 8 hours | £1.28 |
What to know
Overnight cost depends heavily on the model type. Compressor models often draw less power than desiccant models, especially in warmer rooms.
Practical guidance
Use the humidistat target rather than leaving the machine permanently on maximum.
How to use this
If drying clothes indoors, factor in the value of reducing damp and condensation as well as electricity cost.
FAQs
Is it okay to run one overnight?
Follow the manufacturer's safety guidance and use a suitable humidity setting.
Does laundry mode cost more?
It can, because the unit may run harder for longer.
How do I measure exact cost?
Use a plug-in energy meter over several typical nights.
Is it cheaper than heating?
It solves a different problem, but usually uses far less power than an electric heater.
Last reviewed 3 May 2026. Source: Ofgem energy price cap. Figures are estimates. Actual prices vary by region, supplier, tariff, payment method and meter type.