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Data through July 2026

Running cost · Dehumidifiers · ENERGY STAR certified

Mountman MM-HY9DE003

The Mountman MM-HY9DE003 is certified at 105 kWh per year, roughly $19 at the national average — though seasonal use means your real bill lands in a few months, not twelve. Only a handful of certified dehumidifiers do better: it ranks 11 of 533 and undercuts the median by 69%. The same unit costs $13 a year in Louisiana but $50 in Hawaii — electricity rates, not the appliance, make the difference. It also meets ENERGY STAR's stricter “Most Efficient” criteria.

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$19/yr

$19 · cheapest certified dehumidifiers$514 · priciest
Per month
$1.60
Per day
5¢
Certified use
105 kWh/yr
Type
Portable Dehumidifier
Capacity
9 pints/day
Efficiency (IEF)
1.93 L/kWh
105 kWh2,808 kWh
Where the Mountman MM-HY9DE003 (▮) sits among all 533 certified dehumidifiers, by annual kWh

What it costs in every state

Mountman MM-HY9DE003: 105 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$17
Alaska28.8¢$30
Arizona15.4¢$16
Arkansas14.3¢$15
California33.6¢$35
Colorado17.0¢$18
Connecticut24.2¢$25
Delaware18.5¢$19
District of Columbia25.2¢$26
Florida15.0¢$16
Georgia16.3¢$17
Hawaiipriciest48.0¢$50
Idaho13.7¢$14
Illinois19.2¢$20
Indiana16.7¢$18
Iowa16.0¢$17
Kansas15.3¢$16
Kentucky13.8¢$15
Louisianacheapest12.7¢$13
Maine32.4¢$34
Maryland21.4¢$22
Massachusetts30.5¢$32
Michigan23.1¢$24
Minnesota17.4¢$18
Mississippi14.5¢$15
Missouri16.1¢$17
Montana15.0¢$16
Nebraska13.8¢$14
Nevada12.8¢$13
New Hampshire26.6¢$28
New Jersey25.2¢$26
New Mexico16.1¢$17
New York29.9¢$31
North Carolina15.2¢$16
North Dakota13.4¢$14
Ohio19.4¢$20
Oklahoma14.3¢$15
Oregon16.0¢$17
Pennsylvania21.7¢$23
Rhode Island28.3¢$30
South Carolina15.5¢$16
South Dakota15.4¢$16
Tennessee13.7¢$14
Texas15.9¢$17
Utah13.1¢$14
Vermont23.8¢$25
Virginia17.6¢$18
Washington14.7¢$15
West Virginia15.8¢$17
Wisconsin19.1¢$20
Wyoming14.4¢$15

Certified models closest in efficiency

dehumidifiers within reach of 105 kWh/yr
ModelkWh/yr$/yr (US avg)
CONCETTA AS-CSJ72XK-2WT-OLmost efficient105$19
Dr. Prepare DDH12LAmost efficient105$19
DUMOS AS-CSJ72XK-2WT-OLmost efficient105$19
edx AS-CSJ72XK-2WT-OLmost efficient105$19
Gianna AS-CSJ72XK-2WT-OLmost efficient105$19
IULULU AS-CSJ72XK-2WT-OLmost efficient105$19

Run your own numbers

Your rate, your numbers

Per day
5¢
Per month
$1.60
Per year
$19

105 kWh/yr × 18.3¢/kWh = $19/yr

Prefilled with this model's certified 105 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh comes from the DOE test basis for standardized annual runtime. Damp basements that run a unit year-round will exceed it; seasonal use will come in under.

Questions, answered with the data

How much electricity does the Mountman MM-HY9DE003 use?
ENERGY STAR certifies the Mountman MM-HY9DE003 at 105 kWh per year. The certified annual kWh comes from the DOE test basis for standardized annual runtime. Damp basements that run a unit year-round will exceed it; seasonal use will come in under.
How much does the Mountman MM-HY9DE003 cost to run per month?
About $1.60 a month at the U.S. average residential rate (18.3¢/kWh) — 5¢ a day, or $19 a year. Your state's rate moves this up or down; see the table above.
Is the Mountman MM-HY9DE003 energy efficient?
It uses 69% less electricity than the median certified dehumidifier, placing it in the top 10% of certified models. It also meets ENERGY STAR's Most Efficient criteria.
What does the Mountman MM-HY9DE003 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $13 a year in Louisiana (12.7¢/kWh) and $50 in Hawaii (48.0¢/kWh).

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