Costs
How Much Does a Dehumidifier Cost to Run?
What a dehumidifier costs to run in 2026, by wattage and hours of use, with a calculator to estimate your own. Figures are indicative and depend on your electricity tariff.
In short
A typical home dehumidifier draws somewhere around 150–600 watts. As a very rough 2026 indication, running a 300W unit for a few hours a day might cost somewhere around 10–30 pence per day, depending entirely on your electricity tariff and how long it runs. These figures are indicative, not quotations, and your actual cost depends on the unit's wattage, how long it runs and your unit rate. Use the calculator below to estimate your own.
Key takeaways
- Most home dehumidifiers draw around 150–600 watts.
- Running cost depends on wattage, hours of use and your electricity unit rate.
- As a rough 2026 guide, a 300W unit for a few hours a day might cost around 10–30p daily.
- A dehumidifier manages symptoms of condensation; ventilation and heating address the cause.
- These are indicative figures only — use the calculator for your own tariff and usage.
A dehumidifier can be a genuinely useful tool against condensation and mould, and people are right to ask what it adds to the electricity bill. The honest answer is "it depends" — mostly on the unit's wattage, how many hours it runs, and what you pay per unit of electricity. The ranges below give a sense of scale, and the calculator lets you work out your own figure.
Tip
Estimate your own cost precisely with the Dehumidifier Running Cost Calculator. Enter your unit's wattage, daily hours and electricity unit rate for a figure tailored to you — far more reliable than any generic number.
Important
The figures below are indicative for 2026 only. They are NOT quotations, they were NOT independently surveyed, and they depend entirely on your electricity tariff, the specific unit and how long you run it. Check your own tariff and use the calculator for an accurate estimate.
How the cost is worked out
Running cost is simple arithmetic: power (in kilowatts) multiplied by hours of use, multiplied by your electricity unit rate (pence per kWh). A 300-watt unit is 0.3 kW; run for 5 hours that is 1.5 kWh; at a given unit rate you multiply through to get the cost.
Indicative 2026 running costs
The table assumes continuous running at the stated wattage; real units cycle on and off, so actual costs are often lower. Unit rates vary by tariff and region.
| Unit power | Per hour (rough) | Per 5 hours/day (rough) |
|---|---|---|
| 150 W (0.15 kW) | low single pence | a few pence |
| 300 W (0.30 kW) | a few pence | ~10–20p |
| 600 W (0.60 kW) | several pence | ~20–40p+ |
Note
These ranges assume typical domestic use and a mainstream electricity tariff, and exclude: standing charges; the purchase price of the dehumidifier; and any difference between compressor and desiccant models (desiccant units often draw more power but work better in cold rooms). Your figure will differ — use the calculator.
Compressor versus desiccant
- Compressor dehumidifiers are usually cheaper to run in warm rooms and are the common choice for general home use.
- Desiccant dehumidifiers tend to draw more power but perform better in cold spaces such as unheated rooms and garages.
A dehumidifier treats the symptom
A dehumidifier lowers the moisture in the air, which helps control condensation and mould — but it does not fix why the air is moist. Lasting control usually comes from better ventilation and heating, with the dehumidifier as a helpful extra rather than the whole answer. See what is damp for how condensation forms.
Tip
Running a dehumidifier in a closed room is most efficient. Pair it with the free habits that cut moisture at source — ventilating when cooking and showering, and not drying washing indoors without ventilation — and you will run it for fewer hours.
Keeping costs down
- Size the unit to the room; an oversized machine wastes energy.
- Use the humidistat so it switches off once the target humidity is reached.
- Tackle the moisture source so the unit runs less.
- Check your unit rate and plug your own numbers into the running cost calculator.
Try a related tool
Frequently asked questions
It depends on the unit's wattage, how long it runs and your electricity unit rate. As a rough 2026 guide, a 300W unit run for a few hours a day might cost around 10–30 pence daily. These are indicative figures — use the Dehumidifier Running Cost Calculator for your own tariff.
Sources
- GOV.UK: Damp and mould: understanding and addressing the health risks · England · accessed 27 October 2026
DampSense Editorial Team
Research & editorial
Our editorial team researches UK building-moisture topics using government guidance, public-health sources and established building-science references. We write to help homeowners and tenants make informed decisions, and we flag where professional assessment is needed.
Credentials & limitations: Research-led editorial team. We are not chartered surveyors; our guides are general information, not a professional building survey.
