KOOLMORE KM-RUF-42C
ENERGY STAR certified
Compact freezer · 4.2 cu ft
Inthis freezer costs
about $4 a month
$47 a year
An estimate at your state's average rate — not a guarantee of your bill.
The yellow sticker says $36 a year.
You'll pay $11 more.
Sticker uses 14¢ per kWh. The U.S. average is 18.0¢ per kWh.
Energy use
260 kWh a year
vs similar compact freezer
+5%
Cheaper freezers, same size
ENERGY STAR lists one other certified model at the same 260 kWh a year, size and type, so everything on this page applies to it too.
Cheaper to run, same size
A year at the U.S. average residential rate.
Cost in every state
260 kWh a year × each state's average residential rate (EIA 12-month average through July 2026).
| State | Rate | Per year | Per month |
|---|---|---|---|
| Hawaii | 43.7¢ | $114 | about $9 a month |
| California | 33.1¢ | $86 | about $7 a month |
| Massachusetts | 30.4¢ | $79 | about $7 a month |
| Rhode Island | 29.4¢ | $76 | about $6 a month |
| Maine | 29.3¢ | $76 | about $6 a month |
| New York | 28.4¢ | $74 | about $6 a month |
| Connecticut | 28.2¢ | $73 | about $6 a month |
| Alaska | 27.0¢ | $70 | about $6 a month |
| New Hampshire | 26.8¢ | $70 | about $6 a month |
| District of Columbia | 24.2¢ | $63 | about $5 a month |
Show all 52 statesShow fewer
| Vermont | 23.9¢ | $62 | about $5 a month |
|---|---|---|---|
| New Jersey | 23.6¢ | $61 | about $5 a month |
| Maryland | 22.3¢ | $58 | about $5 a month |
| Michigan | 21.0¢ | $55 | about $5 a month |
| Pennsylvania | 20.8¢ | $54 | about $4 a month |
| Illinois | 19.0¢ | $49 | about $4 a month |
| Wisconsin | 18.8¢ | $49 | about $4 a month |
| Ohio | 18.3¢ | $48 | about $4 a month |
| U.S. average | 18.0¢ | $47 | about $4 a month |
| Delaware | 18.0¢ | $47 | about $4 a month |
| Indiana | 17.1¢ | $44 | about $4 a month |
| Virginia | 16.6¢ | $43 | about $4 a month |
| Colorado | 16.6¢ | $43 | about $4 a month |
| Alabama | 16.5¢ | $43 | about $4 a month |
| Minnesota | 16.2¢ | $42 | about $4 a month |
| Texas | 16.0¢ | $42 | about $3 a month |
| South Carolina | 15.7¢ | $41 | about $3 a month |
| West Virginia | 15.7¢ | $41 | about $3 a month |
| Oregon | 15.6¢ | $41 | about $3 a month |
| Arizona | 15.5¢ | $40 | about $3 a month |
| Florida | 15.4¢ | $40 | about $3 a month |
| New Mexico | 15.2¢ | $40 | about $3 a month |
| Kansas | 15.1¢ | $39 | about $3 a month |
| Georgia | 15.1¢ | $39 | about $3 a month |
| Mississippi | 14.9¢ | $39 | about $3 a month |
| North Carolina | 14.9¢ | $39 | about $3 a month |
| South Dakota | 14.3¢ | $37 | about $3 a month |
| Washington | 14.2¢ | $37 | about $3 a month |
| Wyoming | 14.2¢ | $37 | about $3 a month |
| Iowa | 14.1¢ | $37 | about $3 a month |
| Kentucky | 14.0¢ | $36 | about $3 a month |
| Montana | 13.9¢ | $36 | about $3 a month |
| Missouri | 13.9¢ | $36 | about $3 a month |
| Tennessee | 13.7¢ | $36 | about $3 a month |
| Oklahoma | 13.6¢ | $35 | about $3 a month |
| Nevada | 13.6¢ | $35 | about $3 a month |
| Arkansas | 13.5¢ | $35 | about $3 a month |
| Utah | 13.3¢ | $35 | about $3 a month |
| Louisiana | 13.1¢ | $34 | about $3 a month |
| Nebraska | 12.9¢ | $34 | about $3 a month |
| Idaho | 12.7¢ | $33 | about $3 a month |
| North Dakota | 12.5¢ | $33 | about $3 a month |
What the KOOLMORE KM-RUF-42C costs where electricity is expensive
At Hawaii's average residential rate of 43.7¢ per kWh, the KOOLMORE KM-RUF-42C costs $114 a year — $77 more a year than the label says. The EnergyGuide label estimates $36 a year, because every label in the country is calculated at 14¢ per kWh. At the U.S. average of 18.0¢ per kWh this freezer costs $47 a year, and in North Dakota, the cheapest state, $33 a year.
| Where | Rate | Cost a year | vs the label |
|---|---|---|---|
| Hawaii | 43.7¢ per kWh | $114 | +$77 |
| California | 33.1¢ per kWh | $86 | +$50 |
| Massachusetts | 30.4¢ per kWh | $79 | +$43 |
| Rhode Island | 29.4¢ per kWh | $76 | +$40 |
| Maine | 29.3¢ per kWh | $76 | +$40 |
| North Dakota | 12.5¢ per kWh | $33 | −$4 |
Electricity prices: EIA 12-month average through July 2026, residential sector, average revenue per kWh. Label figure calculated at 14¢ per kWh, the rate the FTC requires on labels.
Full specs
At the U.S. average residential rate this one costs $47 a year — about 5% more expensive to run than the average compact freezer ($45 a year across 935 certified models).
Every model on this scale is ENERGY STAR certified. Range across 935 compact freezers, priced a year at the U.S. average residential rate.
Federal limit for this size and configuration: 290 kWh a year ($52 a year). This model uses 260 kWh a year.
- Brand
- KOOLMORE
- Model number
- KM-RUF-42C
- Type
- Compact freezer
- Capacity
- 4.2 cu ft
- Annual energy use
- 260 kWh a year
- Better than the federal standard
- 10% less energy
- ENERGY STAR Most Efficient
- No
- On the market since
- August 2024
- Certified
- August 2024
- UPC
- 810158926349
- Defrost
- Manual
- Ice maker
- No
- Through-the-door dispenser
- No
- Built-in
- No
- Adjusted volume (cu ft)
- 7.4
- Connected features
- No
Where to buy
We do not sell appliances. These open a search on the retailer's own site.
Common questions
+How much does the KOOLMORE KM-RUF-42C cost to run per month?
about $4 a month at the U.S. average residential rate of 18.0¢ per kWh, or $47 a year. Your cost depends on your state's rate — see the table above.
+How many kWh does the KOOLMORE KM-RUF-42C use?
260 kWh a year, as the manufacturer filed it with the EPA, in the ENERGY STAR certified product database.
+Is the KOOLMORE KM-RUF-42C energy efficient?
It is listed as ENERGY STAR certified. It uses about 5% more electricity than the average compact freezer (average: 248 kWh a year).
+How does the KOOLMORE KM-RUF-42C compare to the average freezer?
The average compact freezer in our database uses 248 kWh a year, costing $45 a year at the U.S. average residential rate. The KOOLMORE KM-RUF-42C uses 260 kWh a year, costing $47 a year.
How we calculate this
Annual energy use (260 kWh a year) is the figure the manufacturer filed for this model with the EPA, in the ENERGY STAR certified product database. Running cost is that figure multiplied by a state's average residential electricity price from the U.S. Energy Information Administration (12-month average through July 2026, average revenue per kWh).
Sources: EPA ENERGY STAR certified product data, updated weekly · U.S. EIA electricity prices, 12-month average through July 2026.