Data through July 2026
Running cost · Dehumidifiers · ENERGY STAR certified
Mountman MM-HY9DE003-W
The Mountman MM-HY9DE003-W 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 12 of 533 and undercuts the median by 69%. Where you live moves the bill from $13 a year in Louisiana to $50 in Hawaii. It also meets ENERGY STAR's stricter “Most Efficient” criteria.
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$19/yr
- 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
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $17 | |
| Alaska | 28.8¢ | $30 | |
| Arizona | 15.4¢ | $16 | |
| Arkansas | 14.3¢ | $15 | |
| California | 33.6¢ | $35 | |
| Colorado | 17.0¢ | $18 | |
| Connecticut | 24.2¢ | $25 | |
| Delaware | 18.5¢ | $19 | |
| District of Columbia | 25.2¢ | $26 | |
| Florida | 15.0¢ | $16 | |
| Georgia | 16.3¢ | $17 | |
| Hawaiipriciest | 48.0¢ | $50 | |
| Idaho | 13.7¢ | $14 | |
| Illinois | 19.2¢ | $20 | |
| Indiana | 16.7¢ | $18 | |
| Iowa | 16.0¢ | $17 | |
| Kansas | 15.3¢ | $16 | |
| Kentucky | 13.8¢ | $15 | |
| Louisianacheapest | 12.7¢ | $13 | |
| Maine | 32.4¢ | $34 | |
| Maryland | 21.4¢ | $22 | |
| Massachusetts | 30.5¢ | $32 | |
| Michigan | 23.1¢ | $24 | |
| Minnesota | 17.4¢ | $18 | |
| Mississippi | 14.5¢ | $15 | |
| Missouri | 16.1¢ | $17 | |
| Montana | 15.0¢ | $16 | |
| Nebraska | 13.8¢ | $14 | |
| Nevada | 12.8¢ | $13 | |
| New Hampshire | 26.6¢ | $28 | |
| New Jersey | 25.2¢ | $26 | |
| New Mexico | 16.1¢ | $17 | |
| New York | 29.9¢ | $31 | |
| North Carolina | 15.2¢ | $16 | |
| North Dakota | 13.4¢ | $14 | |
| Ohio | 19.4¢ | $20 | |
| Oklahoma | 14.3¢ | $15 | |
| Oregon | 16.0¢ | $17 | |
| Pennsylvania | 21.7¢ | $23 | |
| Rhode Island | 28.3¢ | $30 | |
| South Carolina | 15.5¢ | $16 | |
| South Dakota | 15.4¢ | $16 | |
| Tennessee | 13.7¢ | $14 | |
| Texas | 15.9¢ | $17 | |
| Utah | 13.1¢ | $14 | |
| Vermont | 23.8¢ | $25 | |
| Virginia | 17.6¢ | $18 | |
| Washington | 14.7¢ | $15 | |
| West Virginia | 15.8¢ | $17 | |
| Wisconsin | 19.1¢ | $20 | |
| Wyoming | 14.4¢ | $15 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| CONCETTA AS-CSJ72XK-2WT-OLmost efficient | 105 | $19 |
| Dr. Prepare DDH12LAmost efficient | 105 | $19 |
| DUMOS AS-CSJ72XK-2WT-OLmost efficient | 105 | $19 |
| edx AS-CSJ72XK-2WT-OLmost efficient | 105 | $19 |
| Gianna AS-CSJ72XK-2WT-OLmost efficient | 105 | $19 |
| IULULU AS-CSJ72XK-2WT-OLmost efficient | 105 | $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-W use?
- ENERGY STAR certifies the Mountman MM-HY9DE003-W 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-W 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-W 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-W 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).