How much does a dehumidifier cost to run?

Residential dehumidifiers pull 280 to 1,000 watts depending on capacity. A 50-pint unit, the most common size for a basement or large room, runs 500 to 600 watts when the compressor is active. The Frigidaire FFAD5033W1 draws 590 watts. hOmeLabs' HME020031N sits at 580. The Midea Cube, an ENERGY STAR inverter model, pulls 470. Smaller 35-pint portables sit around 350 to 450 watts. Whole-house ducted units from Santa Fe and AprilAire draw 800 to 1,000.

None of those numbers represent what your meter records. A dehumidifier's compressor cycles on and off based on the humidistat reading. When humidity at the sensor drops below the set point, the compressor stops and only the fan continues at 30 to 50 watts. In a moderately humid space with a properly sized unit, the compressor runs about 60% of the time the unit is on. That 60% is the duty cycle, and it is the single biggest reason people overestimate their dehumidifier's electricity cost.

A 500-watt unit running 12 hours a day at 60% duty cycle uses 3.6 kWh per day. At the national average rate, that's $0.65 a day or about $20 a month. Over a five-month humidity season (May through September), the total is roughly $97. The dehumidifier appliance page lists wattage for portable and whole-house models from the major brands, with duty-cycle-adjusted costs at your state's rate.

State rates swing the monthly cost of a dehumidifier by a factor of three. A 500-watt unit running 12 hours a day at 60% duty cycle costs $13 a month in Louisiana at 12.44¢/kWh, $16 in Texas at 14.8¢, $20 at the national average of 18.05¢, $31 in Connecticut at 28.7¢, and $43 in Hawaii at 39.89¢. Over a five-month season, that's $67 in Louisiana, $97 at the national average, and $215 in Hawaii. Same unit, same humidity target, same schedule.

The full state-by-state rate breakdown covers all 50 states and DC with current 2026 residential rates. For context, the dehumidifier lands in the middle of the household appliance cost ranking: less expensive than a water heater or central AC, more than a ceiling fan or LED lighting.

A portable 50-pint unit covers 1,000 to 2,000 square feet and draws 500 to 600 watts. Running two portables in separate zones doubles the electricity cost. A whole-house ducted dehumidifier (Santa Fe Compact70, AprilAire E130) draws 800 to 1,000 watts but replaces both portables from a single installation point tied into the HVAC ductwork.

A single 900-watt whole-house unit at 14 hours a day and 60% duty cycle uses 7.56 kWh/day, or $41 a month at the national average. Two 500-watt portables covering the same area use 7.2 kWh/day combined, or $39. Electricity is roughly a wash. The whole-house unit costs $1,200 to $2,000 installed versus $250 to $400 for a pair of portables. The trade-off is noise, maintenance (one filter versus two buckets to empty), and whether the house has ductwork to begin with.

Indoor humidity between 30% and 50% is the target range. Below 30%, air dries out skin and cracks hardwood floors. Above 50%, mold spores and dust mites reproduce faster. The DOE recommends setting the humidistat to 50% unless mold is already present, in which case 45% is more appropriate. Going below 40% wastes energy with diminishing returns on comfort.

A WiFi hygrometer (the Govee H5075 runs about $15) lets you track humidity room by room. In dry climates and cold months, many basements stay below 50% without help. Shutting the unit off from November through March in those conditions saves five months of electricity. In humid climates like Houston, Mobile, or Charleston, the unit runs May through October and sometimes year-round.

Continuous drain via a gravity hose or condensate pump eliminates the full-bucket shutoff problem. When the bucket fills, the unit shuts off until someone empties it, then restarts the compressor from cold. Each cold restart pulls a brief surge of higher current. Continuous drain keeps the compressor cycling smoothly and cuts electricity use 15% to 25% over a season, per manufacturer data from Frigidaire and AprilAire.

An air conditioner removes humidity as a byproduct of cooling. If the AC is already running, adding a dehumidifier to the same conditioned space is usually redundant. The AC cost per hour breakdown covers the full math by BTU size and SEER rating.

The dehumidifier earns its electricity in three situations. In shoulder seasons (April, May, October in most of the US), temperatures are comfortable but humidity stays high. Running the AC to dehumidify overcools the house and costs five to ten times more per day. In basements and crawlspaces the central system doesn't reach, the dehumidifier is the only option. And in regions where the dew point stays above 60°F for weeks but temperatures rarely break 80°F, a dehumidifier at $0.65 a day handles the moisture at a fraction of what the AC would cost for the same result. In a Houston July, you will likely run both. In a Virginia May, the dehumidifier alone does the job.

ENERGY STAR-certified dehumidifiers use at least 15% less energy than the federal minimum standard, measured by Integrated Energy Factor (liters of water removed per kWh consumed). In practice, a certified 50-pint unit draws 400 to 470 watts versus 550 to 600 for a non-certified model of the same capacity.

The Midea Cube at 470 watts versus the Frigidaire FFAD5033W1 at 590 watts shows the range. Over a five-month season at 12 hours a day, the Midea uses roughly 510 kWh versus 640 kWh for the Frigidaire. At the national average rate, that's $92 versus $115 for the season. The $23 seasonal savings means the higher upfront cost of the ENERGY STAR model pays for itself in two to three seasons at average rates, faster in high-rate states. The current list of certified models is on the ENERGY STAR dehumidifier product finder.

Dehumidifier wattage, daily runtime, and your state's electricity rate all change the monthly cost. Plug your numbers into the calculator below. For the basement scenario, use 14 hours a day. For a bedroom, 8.

If the dehumidifier is part of a broader bill increase and the source isn't clear, the high-bill diagnostic walkthrough covers how to isolate which appliance is driving the change.