Dehumidifier size and running-cost calculator
Sources awaiting check
Work it out for your home
Worked example
For a heated bedroom and a made-up 200 W dehumidifier run for 8 hours a day on a 25p/kWh tariff:
- Suggested type: compressor (the room is heated).
- Energy: 200 W × 8 h = 1.6 kWh a day.
- Cost: £0.40 a day, £2.80 a week, £72.80 over the October to March season (182 days).
Source: Manufacturer documentation, awaiting check
Tell us the problem, the space and how warm the room is, and we'll suggest a type. Add the machine's power and your electricity unit rate to see what it costs to run.
How it works
- Type: compressor models suit heated rooms; desiccant models keep working in cold ones.
- Size: we show the band from a manufacturer's published sizing guide, and nothing until we've checked one.
- Running cost: power (W) × hours a day × your unit rate (p/kWh) ÷ 1,000 gives pence a day. The season is 1 October to 31 March, 182 days.
- Drying washing: tick the box to compare the cost of one load with a tumble dryer, using the dryer's kWh per load from its energy label.
What we don't do
We don't store prices or pick products. The figures are yours, and the maths is shown so you can check it.
FAQs
Do I need a dehumidifier at all?
Often not. Try the free fixes first: open trickle vents, run extractor fans, dry washing outdoors where you can, and heat steadily. A dehumidifier helps when a room stays damp after that.
Where do I find my unit rate?
On your electricity bill or in your supplier's app, in pence per kWh.
Read the guide: What size dehumidifier do I need?
More tools
Sources
- Desiccant dehumidifiers keep working in cold rooms, where compressor models extract less (Manufacturer documentation), awaiting check
- Manufacturer sizing guide: extraction capacity by home size (Manufacturer documentation), awaiting check