Data through April 2026
Running cost · Computer Monitors · ENERGY STAR certified
Vastec MF2439-K
At the standardized usage ENERGY STAR assumes, the Vastec MF2439-K consumes 36 kWh a year — about $6.70 at the U.S. average electricity rate ($0.56 a month). That's 21% less than the median certified computer monitor, placing it comfortably in the efficient third of the field (253 of 1482). Where you live moves the bill from $4.40 a year in North Dakota to $17 in Hawaii.
Estimated annual running cost · U.S. average rate 18.8¢/kWh
$6.70/yr
- Per month
- $0.56
- Per day
- 2¢
- Certified use
- 36 kWh/yr
- Screen size
- 23.8 in
- Panel
- IPS LCD
- On-mode power
- 11.36 W
- Sleep-mode power
- 0.11 W
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 17.4¢ | $6.20 | |
| Alaska | 27.4¢ | $9.73 | |
| Arizona | 15.5¢ | $5.51 | |
| Arkansas | 14.2¢ | $5.04 | |
| California | 35.3¢ | $13 | |
| Colorado | 16.5¢ | $5.89 | |
| Connecticut | 32.2¢ | $11 | |
| Delaware | 18.8¢ | $6.69 | |
| District of Columbia | 25.4¢ | $9.04 | |
| Florida | 15.4¢ | $5.47 | |
| Georgia | 15.4¢ | $5.47 | |
| Hawaiipriciest | 46.6¢ | $17 | |
| Idaho | 12.7¢ | $4.52 | |
| Illinois | 20.5¢ | $7.29 | |
| Indiana | 17.9¢ | $6.37 | |
| Iowa | 13.9¢ | $4.93 | |
| Kansas | 15.8¢ | $5.62 | |
| Kentucky | 15.0¢ | $5.35 | |
| Louisiana | 14.4¢ | $5.14 | |
| Maine | 28.4¢ | $10 | |
| Maryland | 22.1¢ | $7.85 | |
| Massachusetts | 29.4¢ | $10 | |
| Michigan | 21.4¢ | $7.61 | |
| Minnesota | 16.4¢ | $5.83 | |
| Mississippi | 16.8¢ | $5.96 | |
| Missouri | 14.0¢ | $4.99 | |
| Montana | 13.9¢ | $4.95 | |
| Nebraska | 13.3¢ | $4.73 | |
| Nevada | 14.3¢ | $5.09 | |
| New Hampshire | 27.2¢ | $9.69 | |
| New Jersey | 23.5¢ | $8.37 | |
| New Mexico | 15.2¢ | $5.39 | |
| New York | 29.4¢ | $10 | |
| North Carolina | 16.3¢ | $5.78 | |
| North Dakotacheapest | 12.3¢ | $4.40 | |
| Ohio | 19.5¢ | $6.94 | |
| Oklahoma | 13.3¢ | $4.74 | |
| Oregon | 15.8¢ | $5.62 | |
| Pennsylvania | 21.5¢ | $7.64 | |
| Rhode Island | 28.3¢ | $10 | |
| South Carolina | 17.1¢ | $6.07 | |
| South Dakota | 14.5¢ | $5.17 | |
| Tennessee | 14.9¢ | $5.32 | |
| Texas | 17.0¢ | $6.05 | |
| Utah | 13.3¢ | $4.73 | |
| Vermont | 24.6¢ | $8.74 | |
| Virginia | 17.4¢ | $6.19 | |
| Washington | 14.4¢ | $5.11 | |
| West Virginia | 16.1¢ | $5.72 | |
| Wisconsin | 19.2¢ | $6.84 | |
| Wyoming | 14.7¢ | $5.22 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| INSYS HY2-215LD-2 | 36 | $6.70 |
| HP E24 G5 | 36 | $6.70 |
| Lenovo C20238FS0 | 36 | $6.70 |
| DELL SE2426H | 36 | $6.70 |
| Acer EK251Q | 36 | $6.71 |
| AOC 24B31H | 36 | $6.71 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.56
- Per year
- $6.78
36 kWh/yr × 18.8¢/kWh = $6.78/yr
Prefilled with this model's certified 36 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh (TEC) assumes the monitor is on 35% of the day and asleep the other 65%, per the ENERGY STAR test basis.
Questions, answered with the data
- How much electricity does the Vastec MF2439-K use?
- ENERGY STAR certifies the Vastec MF2439-K at 36 kWh per year. The certified annual kWh (TEC) assumes the monitor is on 35% of the day and asleep the other 65%, per the ENERGY STAR test basis.
- How much does the Vastec MF2439-K cost to run per month?
- About $0.56 a month at the U.S. average residential rate (18.8¢/kWh) — 2¢ a day, or $6.70 a year. Your state's rate moves this up or down; see the table above.
- Is the Vastec MF2439-K energy efficient?
- It uses 21% less electricity than the median certified computer monitor, placing it in the efficient third of certified models.
- What does the Vastec MF2439-K cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $4.40 a year in North Dakota (12.3¢/kWh) and $17 in Hawaii (46.6¢/kWh).