Appliances / Dehumidifiers / Mountman
Mountman MM-HY9DE003-W
9 pints/day · Portable Dehumidifier dehumidifier
Check the price at the store, then add $153 of electricity to get the true cost. We may earn a commission if you buy through these links; as an Amazon Associate we earn from qualifying purchases.
- Price. Check what it costs at the store.
- Plus running cost. Add $153 of electricity over 8 years. That is the part the price tag hides.
- Compare. Pick your state below, then check the cheaper-to-run models of the same size.
About the Mountman MM-HY9DE003-W
The Mountman MM-HY9DE003-W is a 9 pints/day portable dehumidifier dehumidifier certified by ENERGY STAR. Its official test figure is 105 kWh of electricity a year, which at the U.S. average price of 18.19¢ per kWh comes to $19 a year, or $153 over a typical 8-year life.
Among 489 portable dehumidifier models it ranks #12 for running cost, in the cheapest 10%.
Cost to run where you live
105 kWh a year (ENERGY STAR test figure) × 18.19¢ per kWh, the average residential price in the U.S. for Jan–Aug 2026 (EIA). Your bill depends on your utility and how you use it.
One of the cheapest to run
No ENERGY STAR model of the same type and size uses less electricity.
Specs
| Brand | Mountman |
| Model | MM-HY9DE003-W |
| Type | Portable Dehumidifier |
| Energy use | 105 kWh / year |
| Size | 9 pints/day |
| Water removed | 9.00 pints/day |
| Efficiency (IEF) | 1.93 L/kWh |
| Refrigerant | R-290 |
| Most efficient | Yes |
Specs and energy use from the ENERGY STAR certified products list (U.S. EPA). An asterisk in a model number stands for colour or finish codes. HouseholdLeak is not affiliated with ENERGY STAR or the EPA.
Questions people ask
How much does the Mountman MM-HY9DE003-W cost to run?
About $19 a year at the U.S. average electricity price (18.19¢/kWh), based on its ENERGY STAR rating of 105 kWh a year. In a state with expensive power it can be much more; pick your state on this page to see your number.
How much will the Mountman MM-HY9DE003-W cost in electricity over its life?
About $153 over 8 years, a typical life for a dehumidifier. Add that to the price you pay to get the true cost to own.
Is the Mountman MM-HY9DE003-W energy efficient?
It is ENERGY STAR certified, which means it meets the EPA's efficiency requirements for its type.
Want the cheapest picks every week?
Join the free Leak Club. One short email with the lowest-cost picks we found.