How much does a dehumidifier cost per month in New Hampshire?

About $12.44 a month, assuming 500 W at a 60% duty cycle, 12 hours a day, 150 days a year at 27.64¢/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?

New Hampshire has the 8th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $98.06 a year.

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Cost to run a dehumidifier in New Hampshire (August 2026 rates)

At 27.64¢ per kilowatt-hour — New Hampshire's average residential price in August 2026 — running a dehumidifier costs $149 a year. That is 52% more than the national average of $98.06. New Hampshire's residential rate is up 13.1% from August 2025, which moves this appliance from $132 to $149 a year.

Per hour: 8.3¢
Per day of use: 99.5¢
Per month: $12.44
Per year: $149

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 New Hampshire compares

New Hampshire pays 27.64¢/kWh, the 8th most expensive residential electricity of the 51 U.S. jurisdictions EIA reports. For this appliance that works out to $51.19 more a year than the typical U.S. household pays for the same use. Running the same dehumidifier costs $68.69 a year in Nevada and $255 in Hawaii, so where you live changes this bill by $186 a year.

State	Rate	Per month	Per year
New Jersey	24.61¢	$11.07	$133
District of Columbia	25.98¢	$11.69	$140
New Hampshire	27.64¢	$12.44	$149
Rhode Island	28.18¢	$12.68	$152
New York	28.65¢	$12.89	$155

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

What else costs about the same in New Hampshire

Well pump$151 a year in NH Gaming pc$161 a year in NH Aquarium$163 a year in NH

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 New Hampshire?: About $12.44 a month, assuming 500 W at a 60% duty cycle, 12 hours a day, 150 days a year at 27.64¢/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?: New Hampshire has the 8th most expensive average residential rate in the country, so this appliance costs more here than the U.S. average of $98.06 a year.