Check Whether Air Purifiers Have an Efficiency Grade Too

Which numbers do you look at before the grade?

Start with the coverage area your room needs. If you only compare watts between candidates with different areas, you lose track of which space each product is for. The LG Electronics candidates I checked differ, at 62㎡ and 50㎡. A lower wattage on the smaller-area model does not mean you can use it under the same conditions in a larger space.

The Korea Energy Agency's air purifier list on October 8, 2026 shows passive standby mode power consumption (W), active standby mode power consumption (W), the efficiency grade, and the previous efficiency grade. Specifications while running and specifications on standby need to be read separately. A low standby wattage doesn't let you conclude that power consumption while running is also low.

How do the two models split on coverage area?

The table above is based on the official LG Electronics page and the Korea Energy Agency list as I saw them on October 8, 2026. Check the selling price on the sales page of the purchase link on the day you buy. The two candidates share the same size and weight, so body size tells you nothing about the difference in coverage area. Read the full model name down to the last letter along with the manufacturer's area item.

Do the agency list and the manufacturer's grade match?

In this check, the AS183HWWA had an agency efficiency grade of 2, with 1.16W in passive standby mode and 0.8W in active standby mode. The AS153HWWC was shown with an agency efficiency grade of 1, a previous efficiency grade of 2, 1.15W in passive standby mode, and 0.78W in active standby mode. The grade 2 on the AS153HWWC manufacturer page and the grade 1 in the agency's efficiency grade column differ.

The fact that there is a separate previous efficiency grade column doesn't tell you which standard the manufacturer applied. Neither source gives the manufacturing date of the product on sale. The agency's general notice says values can change depending on changes to standards and measurement methods and on the manufacturing date, but it does not explain why this model's difference arose. So check the label and manufacturing date of the product on sale yourself.

Can you work out monthly power use from the watts?

Multiplying watts by hours lets you build an example of electricity use. If you assume 34W running for a full 8 hours, that is 34÷1,000×8=0.272kWh. It is only a calculation on the assumption that one operating state continues, not actual use measured under automatic mode or several fan speeds. Don't read the manufacturer's wattage as a promise that it stays that way at home.

Filter replacement intervals, operating modes, and coverage area are items to check separately in the manual for that model. The efficiency grade is information for comparing energy use. It is not information that guarantees preventing any particular illness or removing every pollutant, and this table has no basis for stretching the grade into a health benefit.

Which one should be your starting point for your room?

If the manufacturer's coverage area fits the 50㎡ range, you can use the AS153HWWC as your starting point for comparison, and if it fits the 62㎡ range, the AS183HWWA. But the two candidates have the same body size, so if you want to put a smaller product in a tight spot, the area difference doesn't answer that. Check the area you need and the spare installation room separately.

Even if you want to push it right against a wall or into a gap between furniture, you can't decide it fits just from the 315mm width. That's because the model-specific installation conditions for air intake and exhaust are missing from the material in this article.

To sum up, the order is this. Decide the coverage area your room needs, measure the spare room where it will go, and then check the grade and manufacturing date on the label of the product on sale. After that, you can compare the watts.