How much does a dehumidifier cost per month in South Carolina?

About $7.00 a month, assuming 500 W at a 60% duty cycle, 12 hours a day, 150 days a year at 15.55¢/kWh.

How many kilowatt-hours does a dehumidifier use?

Roughly 540 kWh a year under these assumptions, or 0.30 kWh for every hour it runs.

Is that expensive compared with other states?

South Carolina has the 21st cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $99.04 a year.

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Cost to run a dehumidifier in South Carolina (June 2026 rates)

At 15.55¢ per kilowatt-hour — South Carolina's average residential price in June 2026 — running a dehumidifier costs $83.97 a year. That is 15% less than the national average of $99.04. South Carolina's residential rate is up 5.1% from June 2025, which moves this appliance from $79.87 to $83.97 a year.

Per hour: 4.7¢
Per day of use: 56.0¢
Per month: $7.00
Per year: $83.97

Assumption: 500 W at a 60% duty cycle, 12 hours a day, 150 days a year — 540 kWh a year. A 50-pint basement unit. Runtime is driven by humidity, not by a clock, so a damp basement can push the duty cycle near 1.0. Use the calculator to swap in the numbers from your own model.

How South Carolina compares

South Carolina pays 15.55¢/kWh, the 21st cheapest residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $15.07 less a year than the typical U.S. household pays for the same use. Running the same dehumidifier costs $70.79 a year in Nevada and $285 in Hawaii, so where you live changes this bill by $214 a year.

State	Rate	Per month	Per year
South Dakota	15.36¢	$6.91	$82.94
West Virginia	15.45¢	$6.95	$83.43
South Carolina	15.55¢	$7.00	$83.97
Kansas	15.71¢	$7.07	$84.83
Iowa	15.93¢	$7.17	$86.02

States ranked by average residential price, cheapest first. See all 51 states for a dehumidifier.

What else costs about the same in South Carolina

Well pump$85.14 a year in SC Gaming pc$90.81 a year in SC Aquarium$91.95 a year in SC

Cutting the number down

Fixing the water source — grading, gutters, a sealed crawlspace — retires the running cost entirely instead of paying it every summer.
Setting the humidistat to 50% instead of 35% cuts runtime sharply with no comfort or mold-risk penalty.
The heat a dehumidifier dumps into the room is a bonus in a basement and a cost upstairs in July.

Questions

How much does a dehumidifier cost per month in South Carolina?: About $7.00 a month, assuming 500 W at a 60% duty cycle, 12 hours a day, 150 days a year at 15.55¢/kWh.
How many kilowatt-hours does a dehumidifier use?: Roughly 540 kWh a year under these assumptions, or 0.30 kWh for every hour it runs.
Is that expensive compared with other states?: South Carolina has the 21st cheapest average residential rate in the country, so this appliance costs less here than the U.S. average of $99.04 a year.