Typical monthly cost is $10 to $30 for a mid-size unit running 12 hours daily

A standard 50-pint dehumidifier drawing 700 watts costs roughly $0.30 to $0.50 per day to operate, assuming an electricity rate of $0.12 to $0.16 per kilowatt-hour — the U.S. average. That works out to $9 to $15 per month if you run it 12 hours daily. Larger units (70-pint models using 1,000 watts) cost $13 to $24 monthly on the same schedule. Smaller units (30-pint, around 400 watts) run $5 to $9 per month.

Your actual cost depends on three things: the wattage of your specific unit, how many hours per day you run it, and your local electricity rate. If you run the dehumidifier continuously (24 hours), double these figures. If you run it only during humid months or a few hours daily, the cost drops proportionally.

Key Takeaways

  • A 50-pint dehumidifier running 12 hours daily costs $9 to $15 per month in electricity, depending on your local power rate.
  • Larger units (70-pint) cost roughly $13 to $24 monthly; smaller units (30-pint) cost $5 to $9 monthly on the same schedule.
  • Your electricity rate varies by state and provider — check your power bill to find your rate per kilowatt-hour for an exact calculation.
  • Running the unit only when humidity is high or for fewer hours daily cuts the monthly cost significantly.
  • Energy Star certified dehumidifiers use 15 to 20 percent less electricity than standard models with the same capacity.

How to calculate your own dehumidifier cost

Find the wattage on your dehumidifier's nameplate or in the manual — it is usually printed on the back or bottom of the unit. Multiply that number by the hours you plan to run it daily, then by 30 days. Divide by 1,000 to convert to kilowatt-hours. Multiply the result by your electricity rate (in dollars per kilowatt-hour).

Example: A 700-watt unit running 12 hours daily for 30 days uses (700 × 12 × 30) ÷ 1,000 = 252 kilowatt-hours. At $0.14 per kilowatt-hour, that costs $35.28 per month. Find your rate on your electric bill — it is usually listed as "price per kWh" or "rate" and varies from $0.10 in Louisiana to $0.22 in Massachusetts.

Larger units cost more but may run fewer hours

A 70-pint dehumidifier removes moisture faster than a 50-pint model, so it may reach your target humidity level in 8 hours instead of 12. Even though the larger unit draws more watts per hour, the shorter runtime can result in similar or lower total monthly cost. A 50-pint running 12 hours daily and a 70-pint running 8 hours daily may both cost $12 to $15 per month.

The trade-off is upfront price: 70-pint models typically cost $100 to $200 more than 50-pint units. If you are choosing between sizes, calculate the monthly operating cost for each based on how long you expect to run it, then add that to the purchase price divided by the number of years you plan to own it. That gives you the true annual cost of ownership.

Energy Star models save 15 to 20 percent on electricity

Dehumidifiers with the Energy Star label use compressors and fans designed to remove the same amount of moisture while drawing less power. A 50-pint Energy Star unit typically uses 550 to 600 watts instead of 700 watts, lowering your monthly cost from $12 to $9 on a 12-hour daily schedule.

Energy Star dehumidifiers cost $50 to $150 more upfront than non-certified models of the same size. At a savings of $3 to $4 per month, the extra cost pays for itself in 12 to 50 months — well within the typical 5 to 10 year lifespan of a dehumidifier. If you plan to run the unit year-round or in a very humid climate, the certified model usually makes financial sense.

Seasonal use cuts your annual cost significantly

Most homes need dehumidification only during warm months or in specific rooms like basements. If you run a 50-pint dehumidifier 12 hours daily for only 6 months (roughly May through October), your annual cost is $54 to $90 instead of $108 to $180. In drier climates or homes with good ventilation, you may use it only 3 to 4 months per year, cutting the cost to $27 to $60 annually.

Humidity levels also vary by room. A basement or bathroom may need continuous dehumidification, while a bedroom or living room may need it only on the most humid days. Running the unit only in the rooms where humidity is actually a problem — and only when the humidity meter reads above 60 percent — reduces operating hours and cost without sacrificing comfort.

Continuous operation versus on-demand use

Some dehumidifiers have a built-in humidistat that turns the unit on and off automatically when humidity rises above or falls below a set level. This feature can reduce operating hours by 30 to 50 percent compared to running the unit continuously. If your 50-pint dehumidifier would normally run 12 hours daily, a humidistat might reduce that to 6 to 8 hours, lowering your monthly cost to $6 to $10.

Portable units without a humidistat require you to turn them on and off manually or use a timer. Forgetting to turn off a dehumidifier can double your electricity cost. If you choose a manual unit, a straightforward plug-in timer (available for $10 to $20) pays for itself in a few months by preventing unnecessary runtime.

Comparing dehumidifier costs to other moisture-control methods

A dehumidifier is not the only way to manage humidity. An air conditioner removes moisture as a side effect of cooling and costs roughly $0.50 to $1.50 per day to run, depending on the unit and outdoor temperature — more than a dehumidifier but justified if you need cooling anyway. A bathroom exhaust fan costs $0.01 to $0.03 per day and works well for localized moisture in kitchens and bathrooms. Improved ventilation (opening windows, using ceiling fans) costs nothing but works only when outdoor humidity is lower than indoor humidity.

For basements or whole-home humidity problems, a dehumidifier is usually the most cost-effective option. For single rooms or temporary moisture (after a flood or during a humid week), a smaller portable unit or improved ventilation may be sufficient and cheaper.

Frequently Asked Questions

Does a dehumidifier use more electricity than an air conditioner?

No. A typical dehumidifier uses 400 to 1,000 watts, while a window air conditioner uses 1,000 to 1,500 watts. However, an air conditioner cools and dehumidifies at the same time, so if you need both, the air conditioner may be more efficient overall. If you need only dehumidification, a dehumidifier costs less to run.

Will running a dehumidifier 24 hours a day double my electricity bill?

It will double the dehumidifier's cost, not your entire bill. A 50-pint unit running 24 hours daily costs $18 to $30 per month instead of $9 to $15. For most homes, that is a $10 to $20 increase in total electricity use — noticeable but not dramatic. Continuous operation is necessary only in very humid basements or commercial spaces.

Can I reduce dehumidifier costs by running it at night only?

Yes, if humidity is lower at night in your climate. In coastal or tropical areas, nighttime humidity is often as high as daytime humidity, so running it only at night saves money without solving the problem. In drier climates, nighttime operation may be sufficient. Check your humidity levels at different times of day with an inexpensive humidity meter ($10 to $20) to decide whether night-only operation will work for you.

What is the difference in cost between a 30-pint and a 70-pint dehumidifier?

A 30-pint unit (400 watts) costs roughly $5 to $9 per month on a 12-hour daily schedule. A 70-pint unit (1,000 watts) costs $13 to $24 monthly on the same schedule. The larger unit costs $8 to $15 more per month but removes moisture faster, so it may need to run fewer hours to reach your target humidity level.

Do dehumidifiers cost more to run in winter?

No. Dehumidifiers cost the same per hour to run year-round because they draw the same wattage regardless of season. However, most homes need dehumidification only in warm months, so winter operating costs are zero. In basements or crawl spaces where humidity is high year-round, winter costs are the same as summer costs.