Computer Monitors
ASUSMB229
ENERGY STAR certified · Nov 2023
- Annual energy use
- 38.09 kWh/yr
- Screen size
- 21.5 in
- On-mode power
- 11.88 W
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How this is calculated
- Annual energy use is the figure ENERGY STAR lists for this model under typical test conditions. It is not measured in your home.
- Yearly cost = annual kWh × your rate. Monthly cost is the yearly cost divided by 12, a flat average. Five-year cost keeps the rate constant; prices will change.
- Statewide averages are not your utility’s tariff. Use your bill’s rate for a closer number.
- We do not estimate watts or hourly cost: the source data does not include them.
How it compares
Among 611 ENERGY STAR certified monitor models with a similar screen size (18.3 to 24.7 in), this one ranks 256th lowest in annual energy use.
- Median of these models
- 39 kWh/yr
- This model vs the median
- -3%
- Uses less than
- 58% of them
Compared with every comparable model on the ENERGY STAR list, not only the ones published on this site. Same type, similar size.
Same type and size, lower energy use
| Model | kWh/yr | Difference |
|---|---|---|
| EIZO FlexScan FLT | 15 | 15 kWh |
| EIZO FlexScan EV2400R | 22 | 22 kWh |
| Acer V206HQL | 24 | 24 kWh |
| Sharp DD-E224F | 24 | 24 kWh |
| AOC 185LM00019 | 25 | 25 kWh |
Yearly cost by state
Same 38.090 kWh/yr at each state’s average residential price (2026-08).
Comparable models
Same type, within 15% of this model’s screen size.
Specifications
- Annual energy use
- 38.09 kWh/yrENERGY STAR total energy consumption: 35% of the day in on mode, 65% in sleep mode, at 115 V
- Screen size
- 21.5 inScreen size
- On-mode power
- 11.88 WPower in on mode
- Display
- Monitor
- Panel
- IPS LCD
- Resolution
- 1920 x 1080
- Sleep power
- 0.29 W
- Off power
- 0.24 W
- Power source
- Ac to dc external power supply
- USB-C power delivery
- Yes
- Maximum power delivery
- 60 W
- HDR
- N/A
- Maximum brightness
- 234.5 cd/m²
- Markets
- United States, Japan, Canada, Taiwan, Switzerland
- Available on market
- 2024-01-01
- ENERGY STAR ID
- 2732684
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Frequently asked questions
How much electricity does the ASUS MB229 use?
ENERGY STAR lists 38.09 kWh per year under typical test conditions, which assumes 35% of the day in on mode and 65% in sleep mode. Your use will differ with how many hours the monitor is on, its brightness and whether it goes to sleep.
How much does it cost to run?
At statewide average residential prices, the listed annual use costs about $4.85 in Nevada and $17.97 in Hawaii (EIA, 2026-08). Your own utility rate may be different; enter it in the calculator.
How does the ASUS MB229 compare with similar models?
Among 611 ENERGY STAR certified monitor models with a similar screen size, it ranks 256th lowest in annual energy use. Its 38.09 kWh per year is 3% below the median of 39.26 kWh.
What screen size is it?
ENERGY STAR lists a 21.5-inch screen for this monitor.
How much power does it draw when it is on?
ENERGY STAR lists 11.88 W in on mode. The yearly figure also counts sleep mode, so it is not just on-mode watts multiplied by your hours.
Learn more
Methodology and sources
Model data comes from the ENERGY STAR Certified Computer Monitors dataset (EPA). Electricity prices are statewide average residential prices from the U.S. EIA, latest period August 2026. Values are stored locally and refreshed by scheduled imports. Missing values are left blank, never estimated.