Dehumidifier Running Cost Calculator
Enter your dehumidifier's wattage, hours of use per day, how many months you run it each year and your electricity rate. The calculator shows daily, monthly, seasonal and annual running costs, plus total kWh consumed.
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Tip: If your dehumidifier has a humidistat, it cycles the compressor on and off rather than running at full rated wattage continuously. Your actual consumption will be lower than the rated wattage × hours suggests — use a plug-in energy meter for precise figures.
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Dehumidifier Settings
Typical dehumidifier wattage by size
These are indicative ranges only. Actual wattage varies by brand, model and operating conditions. Always check your specific unit's label or manual.
Common questions
How much does a dehumidifier cost to run? +
A 300 W dehumidifier running 8 hours per day uses 2.4 kWh per day. At a typical residential electricity rate, that works out to a modest daily cost that adds up over a full season. The calculator above gives you an exact figure for your wattage and rate.
How many watts does a dehumidifier use? +
Most household dehumidifiers fall in the 200 to 500 W range. Smaller portable units can be around 150 W; larger whole-room or commercial models may exceed 800 W. Check the label on your specific unit for the rated wattage.
How long should I run a dehumidifier per day? +
In damp conditions, 8 to 12 hours per day is common until target humidity is reached. Once the room reaches a comfortable level (typically 40 to 60%), many people reduce hours or rely on a built-in humidistat to cycle the unit automatically. Running it less while maintaining target humidity is the most cost-effective approach.
Is it cheaper to run continuously or in shorter bursts? +
Running only when humidity rises above your target uses less electricity than continuous operation. Many modern dehumidifiers have a built-in humidistat that cycles the compressor on and off automatically — using this feature typically reduces electricity consumption compared to running at full power all day.
Does a dehumidifier use a lot of electricity? +
A dehumidifier uses more than a fan or lamp, but less than a tumble dryer or electric heater. A typical 300 W unit running 8 hours per day uses around 2.4 kWh — comparable to a large television running for the same period. Annual cost depends mainly on how many months you run it and how many hours per day.
Understanding dehumidifier running costs
How much does it cost to run a dehumidifier?
Dehumidifier running costs depend on three things: the rated wattage of the unit, how many hours per day you run it, and your local electricity price. A 300 W dehumidifier running 8 hours per day consumes 2.4 kWh. Multiply that by your electricity rate and the number of days in your season to get total cost.
Wattage and dehumidifier size
Smaller portable units typically draw around 150 to 300 W. Mid-size household models are often in the 300 to 500 W range. Larger units designed for basements or high-humidity environments may draw 500 W or more. These are indicative ranges — actual draw varies by brand, compressor type and operating conditions. The most reliable figure is the rated wattage printed on your unit's label.
Seasonal vs year-round use
Most people run a dehumidifier seasonally rather than year-round. In temperate climates, this is typically 3 to 6 months during the wetter or warmer months when indoor humidity rises. This calculator lets you set months in use separately from annual cost so you can see both the seasonal cost and the annualised figure for comparison.
How a humidistat reduces running costs
A humidistat-controlled dehumidifier cycles on and off based on a target humidity level. When indoor humidity drops to the set point, the compressor stops. This means actual electricity consumption is lower than rated wattage × hours would suggest. If your unit has a humidistat and you set a reasonable target (around 50%), actual consumption can be significantly lower than the calculator's estimate, which assumes continuous operation at rated wattage.
Want to see how a dehumidifier compares to your other appliances? Try the Appliance Electricity Cost Calculator.