Coway AIRMEGA 150 True HEPA Air Purifier

When running at the lowest setting (Silent or Speed 1), the unit is very quiet, with a noise level of about 22–35 dB(A), similar to a whisper or the background noise of a bedroom.

At higher speeds, used for heavy pollution or smoke/dust, the noise level can reach around 50–55 dB(A), which is still within an acceptable range for a high-performance air purifier.

The unit runs on 120 V power (in the US market) or local voltage depending on the region. Maximum power draw is about 35–38 W at high speed; at lower speeds or in Auto Mode under light pollution, it consumes much less.

Because of Auto Mode and low-speed operation, the unit typically saves energy when maximum filtration is not required. Independent reviews note that even if used 24/7 at top speed, the electricity cost is not very high; with moderate use, the yearly operating cost remains reasonable.

Yes, the unit is equipped with a real-time sensor to detect air pollution levels in the room. In Auto Mode, it automatically adjusts fan speed based on detected pollution.

In addition, it has a color-coded Air Quality Indicator that displays the air condition (typically blue, yellow, or red). Users can also turn off the light if they don’t want it visible while sleeping.