Data through June 2026
Running cost · Computer Monitors · ENERGY STAR certified
ViewSonic VS20139
At the standardized usage ENERGY STAR assumes, the ViewSonic VS20139 consumes 37 kWh a year — about $6.83 at the U.S. average electricity rate ($0.57 a month). That's 17% less than the median certified computer monitor, placing it comfortably in the efficient third of the field (353 of 1530). The same unit costs $4.88 a year in Nevada but $20 in Hawaii — electricity rates, not the appliance, make the difference.
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$6.83/yr
- Per month
- $0.57
- Per day
- 2¢
- Certified use
- 37 kWh/yr
- Screen size
- 23.8 in
- Panel
- VA LCD
- On-mode power
- 11.94 W
- Sleep-mode power
- 0.12 W
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $6.11 | |
| Alaska | 28.2¢ | $11 | |
| Arizona | 15.2¢ | $5.66 | |
| Arkansas | 14.1¢ | $5.26 | |
| California | 34.7¢ | $13 | |
| Colorado | 17.1¢ | $6.38 | |
| Connecticut | 24.3¢ | $9.06 | |
| Delaware | 19.3¢ | $7.19 | |
| District of Columbia | 24.4¢ | $9.09 | |
| Florida | 15.1¢ | $5.63 | |
| Georgia | 16.4¢ | $6.10 | |
| Hawaiipriciest | 52.7¢ | $20 | |
| Idaho | 14.4¢ | $5.35 | |
| Illinois | 19.9¢ | $7.41 | |
| Indiana | 17.5¢ | $6.52 | |
| Iowa | 15.9¢ | $5.94 | |
| Kansas | 15.7¢ | $5.85 | |
| Kentucky | 14.3¢ | $5.31 | |
| Louisiana | 13.5¢ | $5.03 | |
| Maine | 29.6¢ | $11 | |
| Maryland | 21.8¢ | $8.14 | |
| Massachusetts | 29.6¢ | $11 | |
| Michigan | 23.0¢ | $8.57 | |
| Minnesota | 17.5¢ | $6.53 | |
| Mississippi | 14.9¢ | $5.54 | |
| Missouri | 16.2¢ | $6.04 | |
| Montana | 15.1¢ | $5.64 | |
| Nebraska | 13.3¢ | $4.94 | |
| Nevadacheapest | 13.1¢ | $4.88 | |
| New Hampshire | 27.0¢ | $10 | |
| New Jersey | 24.9¢ | $9.30 | |
| New Mexico | 15.1¢ | $5.61 | |
| New York | 29.5¢ | $11 | |
| North Carolina | 14.7¢ | $5.49 | |
| North Dakota | 14.1¢ | $5.26 | |
| Ohio | 19.2¢ | $7.15 | |
| Oklahoma | 14.3¢ | $5.34 | |
| Oregon | 16.3¢ | $6.08 | |
| Pennsylvania | 21.7¢ | $8.10 | |
| Rhode Island | 29.2¢ | $11 | |
| South Carolina | 15.6¢ | $5.79 | |
| South Dakota | 15.4¢ | $5.72 | |
| Tennessee | 14.1¢ | $5.24 | |
| Texas | 15.9¢ | $5.94 | |
| Utah | 13.4¢ | $4.98 | |
| Vermont | 24.4¢ | $9.11 | |
| Virginia | 17.2¢ | $6.42 | |
| Washington | 14.9¢ | $5.56 | |
| West Virginia | 15.4¢ | $5.76 | |
| Wisconsin | 19.6¢ | $7.29 | |
| Wyoming | 15.2¢ | $5.68 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| ASUS VA279QGSmost efficient | 37 | $6.83 |
| EIZO FlexScan EV2740Smost efficient | 37 | $6.83 |
| PHILIPS 24B2N3200A | 37 | $6.83 |
| Acer KA272_a | 37 | $6.84 |
| Acer V247Y | 37 | $6.84 |
| AOpen 27CL1_a | 37 | $6.84 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.57
- Per year
- $6.79
37 kWh/yr × 18.3¢/kWh = $6.79/yr
Prefilled with this model's certified 37 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 ViewSonic VS20139 use?
- ENERGY STAR certifies the ViewSonic VS20139 at 37 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 ViewSonic VS20139 cost to run per month?
- About $0.57 a month at the U.S. average residential rate (18.3¢/kWh) — 2¢ a day, or $6.83 a year. Your state's rate moves this up or down; see the table above.
- Is the ViewSonic VS20139 energy efficient?
- It uses 17% less electricity than the median certified computer monitor, placing it in the efficient third of certified models.
- What does the ViewSonic VS20139 cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $4.88 a year in Nevada (13.1¢/kWh) and $20 in Hawaii (52.7¢/kWh).