A dehumidifier uses moderate electricity—typically 300 to 700 watts while running, which costs roughly $10 to $25 per month if it runs eight hours daily

The actual cost depends on three things: the dehumidifier's wattage (printed on the back or in the manual), your local electricity rate, and how many hours per day it runs. A 50-pint dehumidifier drawing 700 watts in a region where electricity costs 14 cents per kilowatt-hour will cost about $0.98 per day of continuous operation. Most homes don't run them continuously—they cycle on and off as humidity rises and falls—so real monthly bills are usually lower than the worst-case number.

The size of the unit matters most. Smaller dehumidifiers (30-pint capacity) typically use 300 to 400 watts. Mid-range models (50-pint) use 500 to 700 watts. Large units (70-pint and above) can reach 1000 watts or more. A larger unit running fewer hours per day often costs less than a smaller one that runs constantly because it removes moisture faster and can stay off longer.

Key Takeaways

  • Most dehumidifiers draw between 300 and 700 watts, which translates to roughly $10 to $25 monthly if run eight hours daily at average U.S. electricity rates.
  • Your actual cost depends on the unit's wattage rating, your local electricity price per kilowatt-hour, and how many hours per day the dehumidifier runs.
  • Larger dehumidifiers use more power but often cost less to operate overall because they remove moisture faster and cycle off sooner.
  • Running a dehumidifier continuously costs significantly more than letting it cycle on and off as your home's humidity changes.

How to Find Your Dehumidifier's Wattage

The wattage is always listed on a label on the back or bottom of the unit, or in the owner's manual. Look for a line that says "Power" or "Watts" followed by a number and the letter W. Write this number down—you'll need it to calculate cost.

If you can't find the label, check the manual online by searching the brand name and model number. The model number is usually printed on the same label as the wattage. If the manual lists amps and volts instead of watts, multiply amps by volts: for example, 6 amps × 120 volts = 720 watts.

Calculating Your Monthly Electricity Cost

Use this straightforward formula: (Wattage ÷ 1000) × Hours per day × Days per month × Your rate per kilowatt-hour = Monthly cost.

Here's a real example. A 50-pint dehumidifier rated at 650 watts, running 8 hours daily in a state where electricity costs $0.14 per kilowatt-hour:

(650 ÷ 1000) × 8 × 30 × $0.14 = $21.84 per month

To find your electricity rate, check your most recent utility bill—it's usually listed as "price per kWh" or "rate per kilowatt-hour." Rates vary widely by region and season. Louisiana averages around $0.10 per kilowatt-hour, while Massachusetts averages $0.18. If you're unsure, call your utility company and ask.

When a Dehumidifier Costs Less Than You'd Expect

Dehumidifiers don't run at full power all the time. Most models have a humidistat—a sensor that turns the unit off once the room reaches your target humidity level, then turns it back on when humidity rises again. In a moderately damp basement, a dehumidifier might run only 4 to 6 hours daily instead of 24, cutting your cost in half or more.

Seasonal use also matters. If you only need a dehumidifier during summer months or in one room, your annual cost is much lower than running it year-round. A unit that costs $22 per month during the three humid summer months costs only $66 for the season, not $264.

Newer models with variable-speed compressors use less electricity than older fixed-speed units because they adjust their power output to match the moisture load. An Energy Star certified dehumidifier may use 15 to 20 percent less electricity than a standard model of the same size.

Comparing Dehumidifier Costs to Other Appliances

A dehumidifier's electricity use falls in the middle range for household appliances. An air conditioner uses 3000 to 5000 watts and costs significantly more to run. A window air conditioner might cost $30 to $50 per month. A space heater uses 750 to 1500 watts and costs roughly the same as a dehumidifier. A refrigerator runs 24/7 but uses only 150 to 800 watts depending on size, so it often costs less monthly despite constant operation.

If you're trying to reduce electricity use, a dehumidifier is not usually the biggest culprit. Heating and cooling systems, water heaters, and older refrigerators typically consume far more power over time.

Ways to Lower Dehumidifier Operating Costs

Set the humidistat to 50 to 55 percent relative humidity rather than lower. Each percentage point lower requires the unit to run longer. Most people feel comfortable and mold growth slows at 50 percent, so going lower wastes electricity without much benefit.

Close doors to unused rooms and run the dehumidifier only in the spaces you occupy. A dehumidifier works most efficiently in a sealed room—open windows and doors force it to work harder and longer.

Empty the water collection bucket or attach a drain hose regularly. A full bucket triggers an auto-shutoff on most models, stopping the unit even if humidity is still high. This forces it to cycle on and off more frequently, wasting energy.

Place the dehumidifier away from walls and furniture. Air needs to flow freely around the intake and exhaust vents. Blocked vents force the unit to work harder and use more power to achieve the same result.

Frequently Asked Questions

Is it cheaper to run a dehumidifier or an air conditioner?

An air conditioner uses 4 to 7 times more electricity than a dehumidifier. If you're choosing between them, a dehumidifier costs far less to operate. However, an air conditioner removes both heat and moisture, while a dehumidifier only removes moisture and actually produces a small amount of heat as a byproduct.

Will a dehumidifier increase my electric bill noticeably?

Most dehumidifiers add $10 to $30 per month to your bill, depending on size and runtime. For many households, this is noticeable but not dramatic—roughly 5 to 15 percent of a typical electric bill. If you're on a tight budget, run it only in the room where you spend the most time.

Does a dehumidifier use more electricity than a fan?

Yes. A ceiling fan uses 15 to 90 watts, while a dehumidifier uses 300 to 700 watts—roughly 4 to 10 times more. However, they do different jobs: a fan circulates air and creates a cooling sensation, while a dehumidifier removes moisture from the air.

Can I run a dehumidifier on a standard outlet without overloading it?

Yes. Standard U.S. outlets are rated for 15 amps at 120 volts, which equals 1800 watts. Most dehumidifiers use 300 to 700 watts, so they're well within that limit. Plug it directly into the outlet rather than through an extension cord or power strip, which can overheat if the dehumidifier draws sustained power.

What's the difference between a dehumidifier's rated wattage and what it actually uses?

The rated wattage is the maximum power the unit draws at full capacity. In real use, it cycles on and off, so average consumption is lower. A 700-watt dehumidifier running 8 hours daily doesn't use 700 watts continuously—it might average 400 to 500 watts depending on how often the humidistat cycles it off.