Coway Airmega 300 vs 400 | Make the Best Out of Your Budget

coway airmega 300 vs 400

Recently, Coway has seen a surge in popularity when it comes to air purifiers! People used to prefer cheaper brands in the past. Coway offers unmatched features for its price point.

You will find many standard features between Coway Airmega 300 vs 400. Notably, a lot of features are uncommon too. In this article, we will see What makes these devices unique?

Quick Comparison Table of Coway Airmega 300 vs 400

Runner Up




Coway Airmega 300

Coway Airmega 400

Coverage Area

1256 Ft2

1560 Ft2


Max2 filter (HEPA + Carbon filter Combination)

Max2 filter (HEPA + Carbon filter Combination)

Fan Speeds



Auto Mode



Energy Star Certified



Rated Power

57 W

66 W

Noise Level

43.2 dBA (Max)

43.2 dBA (Max)

Eco Mode



Air Quality Monitor



Sleep Mode Type




13.5 x 20.9x13.5 Inches

14.8x22.9x 4.8 Inches


21.4 Pounds

24.7 Pounds


5 Year

5 Year

Coway Airmega 300 vs 400 – Major Difference

The main difference between Coway Airmega 300 vs 400 is that Coway Airmega 300 has a low room coverage area of 1256 sq. ft. On the other hand, Airmega 400 has a coverage area of 1560 sq. ft.

Similarities: Coway Airmega 300 vs 400 surprised us!

similarities of coway airmega 300 and 400

Let’s first take a look at the similarities of Coway Airmega 300 vs. 400;

Filtration System

A standard 3-stage air filtration system has been put in place. Firstly, a washable Pre-Filter is a barrier to larger particles like pet hair and pollen. Fortunately, both devices are shipped with a TRUE HEPA filter.

Moving forward, you get two more filters. Uniquely, Coway has proven to be more advanced than it seems. A carbon and HEPA filter are combined into one single filter.

You might be thinking, what was the idea behind merging filters together? We have got positive news for you! Using two separate filters increases the overall cost of purifiers. So, the maintenance of these devices is cheaper this way.

Furthermore, a wide range of odors and VOCs (volatile organic compounds) are cleared through this filter, namely “Coway Airmega Max2”. It removes 99.97% of airborne particles. Also, particles as small as 0.3 microns are trapped.

Smart Auto Mode

We realize the importance of saving electricity and the bills coming with it! Did you know that the more the fan speed, the more electricity air purifiers consume? The question is, how do Coway Airmega 300 and Coway Airmega 400 reduce power usage?

An auto fan smart mode feature evaluates the room’s air quality and adjusts fan speed according to it. Bad quality increases fan speed, whereas a lower rate indicates better indoor air quality while saving energy!

Filter Replacement Indicator

How do you know whether those filters need changing? Voila, they got lights for it. Two lights come with both of our competitors—one for pre-filter, another for the Max2.

An indicator light glows up if the filters are clogged to the point that they cannot provide the usual efficiency. It would be best to replace them as soon as possible in this situation. So, it’s great peace of mind.

Smart Eco Mode

An uncommon feature found in these devices is an Eco mode. You won’t get to see unique features like it in other air purifier models in 2022.

How does this work? It monitors the air quality for 10 minutes. If it remains unchanged, the fan automatically shuts down. Energy wastage is mainly reduced, thanks to ‘Smart Eco Mode”.

LED Display

You are absolutely correct if you think Coway Airmega 300 vs 400 comes with many common features. Air quality monitoring is a common feature of both models.

Take a look at the front; you will see an LED ring. A pollution sensor has been embedded inside its body. It monitors air pollution levels and changes shades accordingly. We love its glow; we hope you would too!

Air Quality Monitoring

The air quality monitor helps you know how many dust particles, pollen, pet dander, smoke particles, and others are in the air. Also, the air quality sensor lets you know when the filter needs changing.

Both Air purifiers have an air quality monitoring feature that displays the air quality in real-time and uses an LED ring. The LED ring can change colors depending on the level of pollutants present in the air.


Finally, the last common feature in these most demanded models is a built-in timer. Do you want to schedule it to turn off at a specific time? If so, you get 3 timing options, 1, 4, and 8 hours in a single button.

Differences: Is it worth comparing Coway Airmega 300 vs 400

features differences of coway airmega 300 and 400 air purifier

Now, its time to disclose the differences between these two Coway devices;

Room Coverage

Strong room coverage is an essential feature in any air purifier. You get to see a considerable difference in this regard.

Starting with the Coway Airmega 400, it covers roughly 1560 sq feet. On the other hand, its twin is reduced to 1256 sq feet in comparison. If you want more extensive room coverage, choose Coway Airmega 300.

Sleep Mode

Now, sleep mode is found in both devices, but what makes it different? Coway Airmega 300 has a manual way. This means you would manually tap the button to activate it.

Alternatively, the Airmega 400 comes with a light sensor. As it gets dark, this sensor automatically turns sleep mode on.

Power Consumption

Lastly, let’s have a peek at their energy consumption. Although both air purifiers are energy efficient, the all-time famous Coway Airmega 400 rates 66W.

In comparison, Airmega 300 operates at 57 watts. While if you’re searching for a beast, Coway Airmega 400 is the best choice to aim for! If you are on a budget, it would be a good choice.

Pros and Cons: How do Coway Airmega 300 and 400 compare?

Pros and Cons of Coway Airmega 300

  • Auto Mode
  • Sleep Mode
  • LED Indicator
  • Filter Indicator Light
  • Less Power Consumption
  • Manual Sleep Mode
  • Lesser Room Coverage

Pros and Cons of Coway Airmega 400

  • Pre-filter is washable
  • Auto Sleep Mode
  • Powerful Fan Motor
  • Larger Coverage Area
  • Excellent Airflow
  • Eco Mode
  • Confusing Filter Indicator Light
  • Sometimes Make Annoying Smell

Common FAQs

How loud is the Coway AirMega 400?

The noise level of Coway Airmega 400 varies from 22dB to 43.2 dB (Low, Med, High settings). So, we can easily say that it is one of the silent air purifiers as it produces only white noise.

Does Coway AirMega 300 produce ozone?

There is no ionizer feature on both Coway Airmega 300 and 400. it means that both models of coway do not produce ozone at all.

Are these air purifiers energy efficient?

Yes, both Airmega 300 and 400 are Energy Star-rated models. These units are energy efficient.

Final Words: What do we think about both devices!

There is a straightforward rule to air purifiers, more the budget, more the options you get! Coway has done an excellent job, producing two of the most feature-loaded devices found in the market.

So, if we compare Coway Airmega 300 vs 400, the Coway 400 is a more efficient air purifier and a clear winner. However, it does come with a powerful motor, consuming more energy. That does not mean its competitor is below it, as the Airmega 300 wins to lower power consumption.

In conclusion, both devices are a win-win. Can you sacrifice energy efficiency for a more potent motor, or do you want a lesser electricity bill? It depends on your requirements at the end of the day.

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