Humidity cost guide
How much electricity does a dehumidifier use?
A dehumidifier’s compressor cycles with humidity, temperature and tank settings. Use the calculator for a planning range, then refine it with measured average power.
Appliance energy cost
Use the power label on your appliance and the electricity rate shown on your bill.
Formula: watts ÷ 1,000 × hours per day × days × electricity rate. Cycling appliances and variable-speed equipment can use less than their full rated power.
What changes the answer?
Rated watts are a ceiling, not a daily average
The fan may continue after the compressor stops, and the compressor may run for long periods in a damp basement. A one-day meter reading can reveal the combined duty cycle.
Drain setup can affect practical runtime
A full bucket stops many units. Continuous drainage removes that interruption, which can improve humidity control but may also increase total operating hours.
Air sealing can be the cheapest efficiency upgrade
Open windows, foundation moisture and outdoor air leaks force the unit to remove new moisture continuously. Fixing the source can save more than changing the humidity set point.
Use this result as a planning range
Use the humidity range recommended for the room and equipment; extremely low settings can waste energy without solving the moisture source.
Review the formulas and public sources in our methodology.