How much does a dehumidifier cost to run?
A dehumidifier typically draws around 300 W while running. Ratings vary widely between models, so check the label and change the figure below.
per kWh
W
g CO2 per kWh
Cost per year
246.92
- Cost per month
- 20.58
- Cost per day
- 0.68
- Cost per hour of use
- 0.08
- Energy per year
- 881.8 kWh
- Energy per day
- 2.4160 kWh
- Carbon dioxide per year
- 220.5
- Annual cost of standby alone
- 1.64
Show the working
- Power = 300
- Hours per day = 8
- Days per year in use = 365
- Electricity price = 0.28
- Standby power = 1
- Grid carbon intensity = 250
- kw = 300 / 1000 = 0.3
- daily_kwh = 0.3 * 8 = 2.4
- standby_kwh = 1 / 1000 * (24 - 8) = 0.016
- Energy per day = 2.4 + 0.016 = 2.416
- Energy per year = 2.416 * 365 = 881.84
- Cost per day = 2.416 * 0.28 = 0.676 48
- Cost per year = 881.84 * 0.28 = 246.915
- Cost per month = 246.915 / 12 = 20.5763
- Cost per hour of use = 0.3 * 0.28 = 0.084
- Carbon dioxide per year = 881.84 * 250 / 1000 = 220.46
- Annual cost of standby alone = 0.016 * 365 * 0.28 = 1.6352
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- daily energy = power in kW x hours
- annual cost = daily energy x days x price per kWh
Nameplate wattage is the maximum draw, not the average. A cycling appliance like a fridge or a freezer averages far less.
Standby draw is small per device and adds up across a house: ten devices at 2 W each is 175 kWh a year.
Running cost of a dehumidifier at different tariffs
| Price per kWh | Per hour | Per year at 8 h/day |
|---|---|---|
| 0.10 | 0.0300 | 87.60 |
| 0.15 | 0.0450 | 131.40 |
| 0.20 | 0.0600 | 175.20 |
| 0.25 | 0.0750 | 219.00 |
| 0.30 | 0.0900 | 262.80 |
| 0.40 | 0.1200 | 350.40 |
Frequently asked
How many watts does a dehumidifier use?
Typically around 300 W while running, though models vary. Check the rating plate.
How much electricity does it use per day?
About 2.40 kWh at 8 hours of use.
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