Dehumidifiers use moderate electricity — typically 300 to 700 watts while running, which costs $10 to $30 per month if you run one continuously

A dehumidifier's power draw depends on its size and how hard it works. A small portable unit might use 300 watts; a large basement model can reach 700 watts or more. To put that in perspective, a typical window air conditioner uses 1000 to 1500 watts, so a dehumidifier uses less than most cooling equipment. Your actual electric bill impact depends on how many hours per day you run it and your local electricity rate.

The real cost question is not whether dehumidifiers use a lot of electricity in absolute terms — they do not — but whether running one makes sense for your situation. A unit that runs 8 hours a day in a damp basement costs less to operate than one that runs 24 hours in a barely-humid room. The machine also works harder (and uses more power) when the air is very wet, so a space that is already moderately dry will draw less electricity than one that is soaking wet.

Key Takeaways

  • Most dehumidifiers draw between 300 and 700 watts, which is less than a typical air conditioner but more than a ceiling fan.
  • Running cost depends on wattage, hours per day, and your local electricity rate — expect $10 to $30 monthly for continuous operation, less if you run it part-time.
  • A dehumidifier works harder and draws more power when the air is very wet, so actual consumption varies based on how humid your space is.
  • The machine's compressor cycles on and off rather than running constantly, so it does not draw full wattage every second it is plugged in.

How dehumidifier wattage compares to other household devices

A 500-watt dehumidifier uses roughly the same electricity as a microwave oven, but a microwave runs for minutes while a dehumidifier might run for hours. Over a full day, the dehumidifier's total energy use can exceed the microwave's. A typical refrigerator uses 150 to 800 watts depending on size and age, but it cycles on and off throughout the day. A window air conditioner uses 1000 to 1500 watts continuously, making it a much heavier load on your electrical system.

The practical difference is that you choose when to run a dehumidifier, whereas a refrigerator runs all the time and an air conditioner runs whenever you set the thermostat. This control means you can reduce electricity use by running the dehumidifier only when you need it — during humid months, in damp rooms, or on days when moisture is high.

What affects how much power a dehumidifier draws

The machine's capacity — measured in pints per day — is the biggest factor. A small 30-pint dehumidifier (suitable for a bedroom or small room) uses around 300 to 400 watts. A large 70-pint unit (for basements or whole-house use) draws 500 to 700 watts. The pint rating tells you how much water the machine can remove from the air in 24 hours; larger capacity means a bigger motor and higher power consumption.

How wet the air is also matters. When humidity is very high, the compressor works harder to cool the coils and extract moisture, drawing more power. In a space that is already moderately dry, the compressor cycles on less often, reducing average power draw. A dehumidifier running in a 95%-humidity basement uses more electricity than the same model running in a 60%-humidity living room.

Older or poorly maintained units also draw more power. A dehumidifier with a clogged filter or dirty coils has to work harder to move air through the machine. Cleaning the filter monthly and emptying the water tank regularly keeps the unit running efficiently.

How to calculate your monthly dehumidifier cost

Start with the wattage (usually printed on the back or in the manual), then estimate how many hours per day you will run it. Multiply wattage by hours to get watt-hours per day, then multiply by 30 for a monthly estimate. Divide by 1000 to convert to kilowatt-hours (kWh), which is how utilities bill you.

For example: a 500-watt dehumidifier running 8 hours per day uses 4000 watt-hours, or 4 kWh, per day. Over 30 days, that is 120 kWh. At $0.12 per kWh (a typical U.S. rate, though yours may be higher or lower), the monthly cost is about $14.40. If you run it 24 hours per day, the cost rises to $43.20 monthly. Check your electric bill to find your actual rate per kWh.

Many people overestimate how long they will run a dehumidifier. If you run it only during humid summer months or only in one room, your actual cost will be much lower than a full-month calculation suggests.

When a dehumidifier makes sense from an electricity standpoint

A dehumidifier is worth the electricity cost if you have a specific moisture problem — a damp basement, a bathroom that stays wet after showers, or a room with visible mold or mildew. In these cases, the dehumidifier prevents damage to walls, insulation, and belongings, which costs far more to repair than the electricity to run the machine.

It is less cost-effective to run a dehumidifier in a space that is only slightly humid or to run it continuously in a dry climate. If your home is already comfortable and dry, the electricity cost outweighs any benefit. Similarly, if you can solve the moisture problem by opening windows, improving ventilation, or fixing a leak, those solutions use no electricity at all.

The most efficient approach is to run the dehumidifier only when needed — during humid months, in rooms where moisture is visible, or when a humidity meter shows levels above 60%. This targeted use keeps electricity costs low while still protecting your space from moisture damage.

Energy-efficient dehumidifier features

Newer dehumidifiers often include a humidistat, which automatically turns the machine on and off based on the humidity level you set. Instead of running constantly, the unit cycles on when humidity rises above your target and shuts off when it drops below it. This feature can cut electricity use by 30 to 50% compared to running the machine continuously.

Some models also have a defrost cycle that prevents ice from building up on the coils in cold spaces. While this cycle uses a small amount of extra electricity, it keeps the machine working efficiently in basements or unheated rooms where temperature drops at night. Without it, the dehumidifier would freeze up and stop removing moisture.

Larger capacity units are often more efficient per pint of water removed, meaning a 70-pint dehumidifier might use less electricity per pint than a 30-pint model. If you need to dehumidify a large space, buying one larger unit is usually cheaper to run than operating multiple smaller ones.

Frequently Asked Questions

Does a dehumidifier use more electricity than an air conditioner?

No. A typical air conditioner uses 1000 to 1500 watts, roughly double what a dehumidifier draws. However, air conditioners cool the air while dehumidifiers only remove moisture, so they serve different purposes. In very humid climates, running both may be necessary.

Can I reduce dehumidifier electricity use by running it at night?

Running it at night does not change how much electricity it uses per hour, but it may reduce total hours if you turn it off during the day. The real savings come from using a humidistat so the machine cycles on and off rather than running constantly, regardless of time of day.

What does "pints per day" mean on a dehumidifier?

It is the amount of water the machine can remove from the air in 24 hours under standard conditions. A 50-pint dehumidifier removes up to 50 pints (about 6 gallons) of water daily. Larger capacity units use more electricity but handle bigger or wetter spaces more efficiently.

Is it cheaper to run a dehumidifier or fix the moisture problem another way?

It depends on the cause. If a leak or poor ventilation is creating the moisture, fixing that costs more upfront but saves electricity long-term. If humidity is seasonal or unavoidable, running a dehumidifier is often the most practical solution despite the ongoing electricity cost.