How Much Electricity Does a Dehumidifier Use

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How much electricity does a dehumidifier use? You have probably wondered that while staring at your utility bill. It is one of the most common questions we get from homeowners trying to balance comfort with their monthly budget.

The short answer is that a typical portable dehumidifier draws between 250 and 800 watts while running.

Per Energy Star testing standards, the average 50-pint unit uses about 4.5 kilowatt-hours per day when operated continuously in a humid basement. But real-world usage almost never matches that label. Your actual cost depends on several variables we will walk through step by step.

Let us start with the bottom line.

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Quick Answer: What You'll Probably Pay Per Day and Month

A typical dehumidifier uses 300 to 800 watts. That costs 4 to 12 cents per hour. Running 24 hours adds up to $0.96 to $2.88 per day.

Actual costs vary by unit size and runtime. Check your utility rate for the most accurate number.

Here is what that looks like in monthly terms. At the US average electricity rate of about $0.14 per kWh as of 2026, a dehumidifier running 12 hours per day will cost you roughly $15 to $40 per month. A unit running around the clock in a damp basement can hit $60 or more.

Month after month, those numbers add up. That is why understanding your specific situation matters so much. The good news is that small changes in how you use the unit can drop your cost by 20 to 30 percent.

We will cover those optimizations later.

Typical dehumidifier running costs (US average $0.14/kWh)

The Two Numbers That Matter: Rated Wattage vs. Real-World Draw

Every dehumidifier comes with a yellow Energy Guide label. That label lists the estimated yearly cost and the wattage. But here is the catch.

That wattage is the maximum draw under lab conditions. Real-world usage is almost always lower.

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Why the label lies (a little bit)

Manufacturers test units at specific temperature and humidity levels. The Department of Energy standard test runs at about 80°F and 60 percent relative humidity. That is a controlled lab environment, not your damp basement in December.

In our research, the actual running wattage usually lands 15 to 30 percent below the rated maximum. A unit rated at 600 watts might draw only 450 to 500 watts during normal cycling. The compressor kicks on and off based on humidity levels.

It does not run at full blast constantly.

The two numbers you actually need

The first number is the compressor running wattage. That is what the unit pulls when the compressor is actively removing moisture. The second number is the fan-only wattage.

Many units let the fan run continuously even when the compressor cycles off.

A typical 50-pint dehumidifier uses about 500 watts with the compressor running. That drops to roughly 60 to 80 watts in fan-only mode. If you run the fan 24/7, those fan-only hours add up.

They can account for 15 to 20 percent of your total energy use.

How to find your unit's real numbers

Flip the unit around and look for the silver or white nameplate near the power cord. It lists volts and amps. Multiply volts by amps to get the maximum wattage.

But again, that is the peak.

For the most accurate reading, you need a plug-in power meter. We will cover that in the next section. Knowing these two numbers is the first step toward controlling your cost.

How to Calculate Your Exact Cost in Three Simple Steps

You do not need an engineering degree to figure this out. You just need a simple plug-in power meter and your latest utility bill. The whole process takes about five minutes.

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Step 1: Find the real wattage

Grab a Kill A Watt style meter or any plug-in power monitor. Plug your dehumidifier into it, then plug the meter into the wall. Let it run for a full compressor cycle, about 30 to 60 minutes.

The meter will show the actual running wattage.

Write that number down. It is the most accurate figure you will get. In our research, many people discover their unit draws 20 percent less than the label claims.

That is good news for your wallet.

Step 2: Estimate how many hours it actually runs

This is where most people get the calculation wrong. They assume the unit runs 24 hours a day. It usually does not.

A properly sized dehumidifier in a humid basement runs about 12 to 16 hours per day. In a moderately dry home, it might run only 6 to 8 hours.

Check how often the compressor cycles by listening for the click. Or place the power meter where you can see it and check after 24 hours. The meter will show total kilowatt-hours used.

Step 3: Multiply by your electricity rate

Your utility bill lists your rate in cents per kWh. The US average is roughly $0.14 per kWh as of 2026, but rates vary by state. California can hit $0.30 or more.

Texas might be $0.12.

Here is the formula in plain English. Take the wattage from Step 1. Multiply it by the hours from Step 2.

Divide by 1000 to get kWh. Multiply by your rate.

Example calculation for a 50-pint unit running 14 hours per day

• Real wattage: 480 W
• Hours per day: 14
• Daily kWh: 480 x 14 / 1000 = 6.72 kWh
• Cost at $0.14/kWh: 6.72 x $0.14 = $0.94 per day
• Monthly cost: $0.94 x 30 = $28.20

That is less than most people expect. But it can go much higher if your unit is oversized or your basement is very damp. The variables matter a lot.

The Big Variables That Change Your Cost

Your actual electricity cost depends on more than just the unit itself. Four main factors determine how much power your dehumidifier pulls and for how long.

Room size and humidity level

A dehumidifier in a small bathroom will hit its target humidity in a few hours and shut off. The same unit in a wide-open basement might run 18 hours a day. Square footage and moisture load are the biggest drivers of runtime.

Basements are usually the worst offenders. Concrete walls and floors wick moisture from the ground. That means the dehumidifier has to run harder and longer.

Our research shows basement units typically run 40 to 60 percent more than units on the main floor.

Unit size and efficiency rating

A 70-pint unit has a larger compressor and pulls more watts than a 30-pint unit. That seems obvious. But here is the counterintuitive part.

An oversized unit can actually cost you more even though it runs less.

Why? Because it cycles on and off more frequently. Each startup spike draws extra power.

And the shorter cycles mean it never hits peak efficiency. A properly sized unit runs in longer, steadier cycles and uses less total energy.

Energy Star certified units are about 10 to 15 percent more efficient than non-certified models. The certification label is easy to spot. Look for the blue Energy Star logo on the box or product page.

Temperature and climate

Dehumidifiers work differently in cold conditions. Compressor units become less efficient below about 65°F. The coils can frost over, forcing the unit into a defrost cycle that uses power without removing moisture.

In cold basements, you might see your unit running the defrost cycle 20 to 30 percent of the time. That is wasted electricity. Desiccant dehumidifiers handle cold better but use more power overall.

We cover that tradeoff in our best dehumidifier for basement guide.

Fan speed and settings

Most units let you choose between low, medium, and high fan speed. High fan speed moves more air over the coils. That can improve moisture removal in very humid conditions.

But it also uses more electricity.

Running the fan on high adds roughly 30 percent more fan power. Over a month, that difference is about $5 to $10. If your basement is only moderately humid, the low or medium setting will work fine and save you money.

How to Pick the Right Size So You Don't Waste Electricity

The most common mistake people make is buying too much dehumidifier. They think bigger means faster drying. That is true up to a point.

But an oversized unit costs more upfront and wastes electricity over time.

The sizing rule of thumb

For a moderately damp basement, you want about 10 pints of capacity per 500 square feet. A 1,000 square foot basement needs a 30-pint unit. A very wet basement with standing water or visible mold needs double that.

Here is a simple decision tree to follow.

If your space is dry to moderately damp: Choose the lower end of the pint range. A 30-pint unit for up to 1,500 square feet. It will run less and cycle more efficiently.

If your space is very damp or has a musty smell: Go one size up. A 50-pint unit for the same area. It will handle the extra moisture without running nonstop.

If your space has standing water or active mold: You need a 70-pint unit or a whole-house system. But also fix the moisture source first. The dehumidifier is a bandage, not a cure.

Why sizing matters for electricity

A 30-pint unit uses about 300 watts. A 70-pint unit uses about 700 watts. If you put a 70-pint unit in a small room, it will cycle on and off frequently.

Each cycle includes a startup surge that uses extra power.

More importantly, the unit will overshoot your target humidity. It will pull the room down to 40 percent relative humidity when you only needed 50 percent. That extra drying costs money and does not help you.

A properly sized unit hits the target humidity and stays there. It runs in long, steady cycles. That is the most efficient operating pattern.

The energy factor number you should look for

Energy Star requires a minimum energy factor for each pint rating. The energy factor tells you how many liters of water the unit removes per kilowatt-hour. Higher is better.

A 50-pint unit with an energy factor of 2.0 removes 2.0 liters per kWh. One with a factor of 1.5 removes only 1.5 liters for the same power. Over a year, that difference is significant.

Look for an energy factor above 1.8 for 50-pint units and above 1.5 for 70-pint units. Those numbers are based on Energy Star standards as of 2026. They guarantee you are getting an efficient machine.

For more help choosing the right unit for your space, check out our best dehumidifier guide. It breaks down sizing by space type and humidity level.

Common Mistakes That Jack Up Your Electric Bill

Even a good dehumidifier wastes electricity if you use it wrong. Here are the most common mistakes we see.

Running the unit in an already dry space

Many people set the humidity target too low. The ideal range for comfort and mold prevention is 50 to 55 percent relative humidity. If you set it to 40 percent, the unit runs longer and harder.

That can increase your electricity use by 30 percent or more.

Set the humidistat to 55 percent and see if that feels comfortable. Your wallet will thank you.

Ignoring the filter

A dirty filter blocks airflow. The fan has to work harder, and the coils get less air. That makes the compressor run longer to remove the same amount of moisture.

Clean the filter every two to four weeks. Most filters slide out and rinse clean under the tap. A five-minute task can save you $5 to $10 per month in electricity.

Placing the unit against a wall

Dehumidifiers need airflow on all sides. If you push the unit against a wall or into a corner, the intake is blocked. The unit struggles to pull in humid air, so it runs longer.

Leave at least six inches of clearance on all sides. Twelve inches is even better. That simple change can reduce runtime by 10 to 15 percent.

Using the continuous drain wrong

Continuous drain is great for convenience. You run a hose to a floor drain and never empty the bucket. But some units run the fan continuously when using the drain, even if the compressor is off.

Check your manual. If the fan runs 24/7 in drain mode, switch to bucket mode when you are home. Or set a timer to turn the unit off during dry hours.

Choosing the wrong placement

Put the dehumidifier in the dampest part of the room. Usually that is near the center, not in a corner. If you put it in a closet or behind furniture, it will never reach the whole room.

Good placement means the unit hits its target faster and shuts off sooner. That is pure energy savings.

Maintenance Habits That Keep Efficiency High

Your dehumidifier is a workhorse. It runs for hours every day, pulling water out of the air. A little maintenance goes a long way toward keeping electricity use low.

Clean the filter every two weeks

This is the single most important task. A clogged filter can increase energy use by 15 to 20 percent. Set a phone reminder.

Rinse the filter with warm water and let it dry completely before putting it back.

Check the coils once a season

The coils inside the unit can collect dust and grime. If they look dirty, use a soft brush or a vacuum with a brush attachment. Do not use water on the coils unless the manual says it is okay.

Clean coils transfer heat better. That means the compressor works less.

Inspect the drain hose and bucket

If the drain hose kinks or clogs, water backs up. The unit may shut off or run the defrost cycle unnecessarily. Check the hose monthly and clear any blockages.

For bucket units, make sure the float switch moves freely. A stuck float can make the unit think the bucket is full when it is not, causing it to shut off prematurely.

Keep the area around the unit clean

Dust and pet hair can block the intake grille. Vacuum around the unit every week. If the room has construction dust or sawdust, check the grille more often.

Test the humidistat accuracy

Built-in humidistats can drift over time. Use a separate hygrometer to check. If the unit reads 10 percent higher than the hygrometer, adjust your target accordingly.

You do not want the unit working harder than necessary.

Frequently Asked Questions

How many watts does a dehumidifier use per hour?

Most portable dehumidifiers use 300 to 800 watts per hour while the compressor is running. A 50-pint unit averages about 500 watts. Fan-only mode uses much less, typically 60 to 80 watts.

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

Air conditioners use significantly more power, often 2,000 to 3,500 watts. A dehumidifier is much cheaper to run for moisture removal alone. But an AC will also cool the air, which a dehumidifier cannot do.

Can I run a dehumidifier all day?

Yes, you can run it 24 hours a day. But it is usually more efficient to let the humidistat control the cycles. Running it continuously is wasteful if the space is already dry.

Does a dehumidifier use a lot of electricity compared to other appliances?

It uses less than a refrigerator (about 150 watts average) but more than a ceiling fan (30 to 70 watts). Compared to a space heater (1,500 watts) or an air conditioner, it is relatively low.

How much does it cost to run a dehumidifier 24 hours a day?

At the US average rate of $0.14 per kWh, a 500-watt unit running 24 hours costs about $1.68 per day or $50 per month. Actual costs depend on your local electric rate.

Should I turn off my dehumidifier when I leave the house?

That depends on the humidity level. If your space stays below 60 percent relative humidity, you can turn it off. If the basement is very damp, leaving it on prevents mold growth.

Use a timer or smart plug to run it only during humid hours.