The useful answerA hypothetical device averaging 450 watts over six operating hours per day costs $14.58 for 30 days at $0.18/kWh. Moisture-removal capacity is a different measurement.

Do not confuse capacity with power

A dehumidifier’s capacity in pints per day describes water removal under test conditions. Its efficiency rating describes water removed relative to energy used. Neither number is a direct replacement for electrical watts in the calculator.

ENERGY STAR explains that dehumidifier testing changed, so older and newer capacity figures are not always directly comparable. Record the model and test basis when comparing labels from different years.

Calculate a use scenario

Using 450 average watts for six hours gives 0.45 × 6 = 2.7 kWh per day. Over 30 days that is 81 kWh. At $0.18/kWh, electricity costs $14.58 for the month.

If the same average draw lasted 12 hours each day, the result would be 162 kWh and $29.16. These are arithmetic scenarios. They do not tell you how long your device must operate to control moisture.

Be precise about the hours

Distinguish six hours connected to power from six hours running at the average draw you entered. A humidistat-controlled unit can cycle as the room conditions change. If you measure energy over a whole day, divide by 24 hours to get a whole-day average and then use 24 hours in the calculator. Do not apply a second cycling discount to an average that already includes cycling.

For example, a measured 3.6 kWh over 24 hours is 150 average watts. Entering 150 watts and 24 hours gives the same 3.6 kWh. Entering 150 watts and only six hours would undercount that measured day.

Match the device to the moisture problem

ENERGY STAR’s buying guidance considers both the area and how damp it is. Also check the drainage arrangement, bucket access and manufacturer clearances. A device that is inconvenient to empty may not run according to your planned schedule.

Record water removal, energy use and the conditions together. Investigate persistent leaks or moisture sources instead of treating the running-cost estimate as a diagnosis. Ask the building manager about issues in a rental that require repairs.

Choose your next step

Continue with the question that matches your next decision:

Shopping options for this guide

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TempPro TP50 indoor thermometer and humidity monitor

Track room temperature and relative humidity when comparing cooling settings. The TP50 shows both readings and records high and low values; it does not measure electricity use.

Before buying: The listing may ship ThermoPro or TempPro branding. The manufacturer page has conflicting backlight information; confirm the supplied version and calibration features with the seller. Follow placement instructions and allow readings to settle. This is not an electricity meter.

View TempPro TP50 indoor thermometer and humidity monitor at Amazon.com (opens in a new tab)

These are shopping options, not hands-on test results. Check the retailer for current specifications, price and availability.

Sources & further reading

Numerical examples are illustrative unless explicitly described as measured. This guide does not claim hands-on product testing. Read the methodology and editorial disclosure.