Data through June 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 $6.53 at the U.S. average electricity rate ($0.54 a month). That's 21% less than the median certified computer monitor, placing it comfortably in the efficient third of the field (266 of 1530). Where you live moves the bill from $4.67 a year in Nevada to $19 in Hawaii.
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$6.53/yr
- Per month
- $0.54
- 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 | 16.4¢ | $5.84 | |
| Alaska | 28.2¢ | $10 | |
| Arizona | 15.2¢ | $5.40 | |
| Arkansas | 14.1¢ | $5.03 | |
| California | 34.7¢ | $12 | |
| Colorado | 17.1¢ | $6.10 | |
| Connecticut | 24.3¢ | $8.66 | |
| Delaware | 19.3¢ | $6.87 | |
| District of Columbia | 24.4¢ | $8.68 | |
| Florida | 15.1¢ | $5.37 | |
| Georgia | 16.4¢ | $5.82 | |
| Hawaiipriciest | 52.7¢ | $19 | |
| Idaho | 14.4¢ | $5.11 | |
| Illinois | 19.9¢ | $7.08 | |
| Indiana | 17.5¢ | $6.23 | |
| Iowa | 15.9¢ | $5.67 | |
| Kansas | 15.7¢ | $5.59 | |
| Kentucky | 14.3¢ | $5.08 | |
| Louisiana | 13.5¢ | $4.80 | |
| Maine | 29.6¢ | $11 | |
| Maryland | 21.8¢ | $7.77 | |
| Massachusetts | 29.6¢ | $11 | |
| Michigan | 23.0¢ | $8.18 | |
| Minnesota | 17.5¢ | $6.24 | |
| Mississippi | 14.9¢ | $5.30 | |
| Missouri | 16.2¢ | $5.77 | |
| Montana | 15.1¢ | $5.39 | |
| Nebraska | 13.3¢ | $4.72 | |
| Nevadacheapest | 13.1¢ | $4.67 | |
| New Hampshire | 27.0¢ | $9.61 | |
| New Jersey | 24.9¢ | $8.88 | |
| New Mexico | 15.1¢ | $5.36 | |
| New York | 29.5¢ | $10 | |
| North Carolina | 14.7¢ | $5.25 | |
| North Dakota | 14.1¢ | $5.03 | |
| Ohio | 19.2¢ | $6.83 | |
| Oklahoma | 14.3¢ | $5.10 | |
| Oregon | 16.3¢ | $5.81 | |
| Pennsylvania | 21.7¢ | $7.73 | |
| Rhode Island | 29.2¢ | $10 | |
| South Carolina | 15.6¢ | $5.53 | |
| South Dakota | 15.4¢ | $5.47 | |
| Tennessee | 14.1¢ | $5.01 | |
| Texas | 15.9¢ | $5.67 | |
| Utah | 13.4¢ | $4.76 | |
| Vermont | 24.4¢ | $8.70 | |
| Virginia | 17.2¢ | $6.13 | |
| Washington | 14.9¢ | $5.31 | |
| West Virginia | 15.4¢ | $5.50 | |
| Wisconsin | 19.6¢ | $6.96 | |
| Wyoming | 15.2¢ | $5.42 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| INSYS HY2-215LD-2 | 36 | $6.53 |
| HP E24 G5 | 36 | $6.52 |
| Lenovo C20238FS0 | 36 | $6.52 |
| DELL SE2426H | 36 | $6.52 |
| Acer EK251Q | 36 | $6.53 |
| AOC 24B31H | 36 | $6.53 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.55
- Per year
- $6.60
36 kWh/yr × 18.3¢/kWh = $6.60/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 $0.54 a month at the U.S. average residential rate (18.3¢/kWh) — 2¢ a day, or $6.53 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 $4.67 a year in Nevada (13.1¢/kWh) and $19 in Hawaii (52.7¢/kWh).