Is Airmega 400S Worth the Investment? A Review

The Coway Airmega 400S is definitely worth considering if you’re concerned about indoor air quality in your home.

This state-of-the-art air purifier outshines run-of-the-mill, low-cost options with its advanced features and long-lasting performance.

With the Airmega 400S, you can enjoy high-quality air purification for years to come.

As Coway’s latest flagship model, the Airmega 400S has garnered a reputation for excellence, holding the title of the best air purifier for five consecutive years.

This trusted device offers a perfect blend of innovation and design, ensuring clean and fresh air in your home.

So, if you have a good deal on the Airmega 400S, don’t hesitate to invest in this remarkable air purifier.

However, it’s essential to stay informed about the latest developments in the market.

For instance, Coway’s newest release, the Airmega Icon, deserves your attention as it is priced similarly to the Airmega 400S.

Be sure to watch emerging models and read comprehensive reviews to make the best choice for your home’s air purification needs.

Airmega 400S featured image

Airmega 400S: Design and Size

ColorWhite, Black
Product Dimensions14.8″D x 14.8″W x 22.8″H
Floor Area1560 Square Feet
Specification MetEnergy Star Certified
Noise Level22 dB
Particle Retention Size0.01 Micron
Controller TypeVera, Amazon Alexa
Wattage66 watts
Item Weight24.7 pounds
Country of OriginKorea, Republic of
Item model numberAirmega 400S
Customer Reviews4.6 out of 5 stars    
5,764 ratings
4.6 out of 5 stars

Overall Design

The Coway Airmega 400S has a modern and sleek design.

Its outer casing is primarily made of high-quality plastic, giving it both durability and a polished appearance.

This air purifier is available in two colors: white and graphite/silver, making it easy for you to choose the one that best matches your home’s interior.

It blends well with most d├ęcor styles, so you can place it in any room without it looking out of place.

Weight and Dimensions

Regarding size, the Airmega 400S measures 14.8″D x 14.8″W x 22.8″H.

This makes it a moderately sized air purifier, which may take up some space in your room but won’t dominate it.

As for its weight, the device is quite manageable and easy to move around if needed.

Just be sure to allocate sufficient room for it to operate efficiently and provide optimum air purification performance.

This way, you can fully enjoy the benefits of better indoor air quality in your home.

Airmega 400S: Features

Unique Features

The Airmega 400S has various unique features that set it apart from other air purifiers.

One notable feature is its Wi-Fi connectivity, which allows you to control the device remotely via the IoT Care app.

This means you can manage your air purifier from the comfort of your couch or even when you’re not at home.

The app is user-friendly and gives you access to numerous functions, such as the scheduler, allowing you to set timers for when you want the purifier to start and stop operating.

Additionally, the Airmega 400S has a power button with a built-in LED light that indicates the air quality in real time, making it easy for you to monitor and adjust as needed.

Basic Features

Airmega 400S Room Coverage

The Airmega 400S also covers the essential features you would expect in a high-quality air purifier.

Its powerful filtration system can clean the air in large rooms up to 1,560 square feet, making it perfect for most living spaces.

  1. Remote Control: Control your Airmega 400S effortlessly with the included remote control, giving you the power to adjust settings from across the room.
  2. Wi-Fi Connectivity: Connect the device to your Wi-Fi network to manage and control your air purifier remotely via the IoT Care app on your smartphone.
  3. Timer: Schedule automatic on and off times for your air purifier with the built-in timer function, ensuring clean air at the most convenient times for you.
  4. Power Button: Monitor and assess the air quality with the LED light on the power button that changes color in real-time to indicate the current air purity level.

Remember, the Airmega 400S offers a perfect balance between unique and basic features, making it a great choice when considering an air purifier for your home.

Airmega 400S: Filter System

The Airmega 400S offers a sophisticated filter system to provide clean air for your home. In this section, we’ll discuss the various filters and their roles in the air purification process.


The first line of defense in the Airmega 400S is the Pre-Filter.

This washable filter helps capture larger particles, such as dust, pet hair, and lint.

Regularly cleaning the pre-filter ensures optimal performance and prolongs the life of the other filters in the unit.

Max2 Filter

Next up in the Airmega 400S is the Max2 Filter.

This all-in-one filter set combines an activated carbon filter and a Green True HEPA Filter that work together to tackle various pollutants.

Activated Carbon Filter

The Activated Carbon Filter is responsible for eliminating odors and harmful gases.

Utilizing activated carbon, this filter efficiently absorbs volatile organic compounds (VOCs), smoke, and other unpleasant smells.

Replacing the carbon filter regularly is crucial for maintaining the unit’s ability to combat odors.

True HEPA Filter

The final stage in the Airmega 400S filter system is the True HEPA Filter.

This high-efficiency particulate air (HEPA) filter captures 99.97% of ultrafine airborne particles as small as 0.3 microns, including pollen, mold spores, and bacteria.

The Airmega 400S’s 4-stage filtration process ensures the air in your home is thoroughly cleaned, providing a healthier environment.

Remember that regular maintenance, such as cleaning the pre-filter and replacing the Max2 filter set, is essential for the unit’s continued efficiency.

With proper care, you can enjoy fresh, clean air from your Airmega 400S air purifier.

Airmega 400S: Performance

Air Cleaning Capability

The Airmega 400S air purifier is designed to improve your indoor air quality by removing various pollutants, allergens, and odors.

With a powerful filtration system, it can effectively filter out pollen, volatile organic compounds (VOCs), and other microbes in the air.

With a CADR rating that indicates its efficiency in cleaning the air, this large room air purifier is suitable for spaces up to 1,560 square feet.

Users have noted a noticeable improvement in air quality within their homes after using the Airmega 400S.

Noise Level

When it comes to noise level, the Airmega 400S is praised for its quiet operation.

Equipped with sleep mode, the air purifier adjusts its fan speed to minimize noise while you rest.

You can expect a pleasant and quiet environment as it continues to clean the air without being obtrusive.

Users appreciate the low noise level, especially during nighttime hours, as it allows for uninterrupted sleep.

Power Consumption

Despite its powerful air-cleaning capability, the Airmega 400S is energy-efficient.

In ecology mode, the air purifier conserves energy by operating only when needed.

It monitors air quality with a built-in indicator, activating auto mode when higher levels of pollutants are detected.

This feature helps you save on electricity while maintaining a clean and healthy indoor environment.

With a relatively low power consumption of around 66 watts on the highest fan speed, you can trust this air purifier to work efficiently without inflating your energy bill.

Users appreciate the convenience of the auto mode, which allows them to focus on other tasks while the air purifier takes care of air quality concerns.

App and Smart Mode

IoCare App

Airmega 400S Smart Control

The Airmega 400S has a dedicated IoCare app, which allows you to control and monitor your air purifier from your smartphone or tablet.

The app is available for both Android and iOS devices, offering Wi-Fi connectivity for ease of use.

Within the app, you can access real-time air quality data, schedule your purifier’s operating times, and receive filter replacement notifications to ensure optimal performance.

Many users have found the IoCare app to be user-friendly and helpful in managing their indoor air quality.

It is particularly useful for those who want to control their device remotely or check on the air quality in specific rooms from anywhere in their house.

Smart Mode

The Airmega 400S also features a smart mode, which uses real-time air quality sensors to adjust the purifier’s speed and filtration settings automatically.

When set to auto mode, the device will continuously monitor the air and make necessary adjustments to maintain a healthy environment.

Airmega 400S 3 Smart Modes

This not only ensures that your air is constantly being purified but can also help you save on energy costs by running the unit more efficiently.

In addition to auto mode, you can enable eco mode using the IoCare app.

Eco mode helps conserve energy by turning off the air purifier when the air is clean enough and only activating the device when the air quality needs improvement.

For those who utilize Amazon Alexa, you’ll be happy to know that the Airmega 400S is compatible with this digital assistant.

This means that you can control your device through voice commands, making it even more convenient for everyday use.

Price and Value for Money


The Airmega 400S is an investment in better air quality in your home.

It is priced higher than some other air purifiers on the market.

It’s important to take into account the features and performance it offers when considering the cost.

You can find the Airmega 400S on sale at major retailers like Amazon. Keep an eye out for sales or discounts to make the most of your purchase.


Investing in the Airmega 400S means you’ll also have peace of mind knowing that it comes with a warranty.

The manufacturers are committed to providing a reliable product, and the warranty will cover any defects in material or workmanship.

It’s essential to register your product with the manufacturer and keep the purchase receipt as proof to ensure you can claim the warranty if needed.

Airmega 400S: Pros and Cons


  1. Efficient performance: The Coway Airmega 400S delivers remarkable air-cleaning performance in large spaces, providing you with fresh and breathable air.
  2. Smart features: With the 400S’s smart features, you can easily control and monitor the air purifier through a mobile app, making it more convenient to maintain your indoor air quality.
  3. Sleek design: The Airmega 400S has a modern look that is available in white and graphite/silver colors, allowing it to blend seamlessly with your home decor.


  1. Size: Although not overly dominating, the unit measures 23 inches high and 15 inches wide and deep, meaning it takes up a bit of room in your space.
  2. Long-term cost: The only drawback in the performance evaluation of the Airmega 400S is its long-term cost, which might be a concern for some users.


Airmega 400s vs. Airmega 300

When comparing the Airmega 400s and the Airmega 300, you’ll notice some significant differences.

The Airmega 400s is app-enabled and offers smart features, making it easy to control and monitor your air purifier remotely.

On the other hand, the Airmega 300 is not equipped with these tech features but does provide the same basic air purification functionality.

In terms of coverage area, the Airmega 400s is designed for larger spaces, capable of handling rooms up to 1,560 square feet.

The Airmega 300, however, is suitable for spaces up to 1,256 square feet.

Both models have similar HEPA filtration systems and are capable of effectively removing pollutants from the air.

One advantage of the Airmega 400s is its slightly lower noise level than the Airmega 300, making it a more subtle addition to your home.

When choosing, consider whether you need the advanced app-enabled features and larger coverage area of the 400s or if the more budget-friendly Airmega 300 is a better fit for your needs.

Airmega 400s vs. Winix 5500-2

Another comparison worth considering is the Airmega 400s versus the Winix 5500-2.

Both air purifiers offer excellent air filtration, but they differ in features, aesthetics, and price points.

While the Airmega 400s boasts a sleek, modern design, the Winix 5500-2 has a more traditional appearance.

In terms of air filtration, both models employ a multi-stage system, including a pre-filter, HEPA filter, and activated carbon filter.

Additionally, the Winix 5500-2 utilizes PlasmaWave technology, which can neutralize viruses, bacteria, and odors without producing harmful ozone.

One significant difference between the two models is the coverage area.

The Airmega 400s is suited for larger rooms up to 1,560 square feet, while the Winix 5500-2 is designed for smaller spaces up to 360 square feet.

Furthermore, the Airmega 400s offers smart app-enabled control, while the Winix 5500-2 uses a remote control for convenience.

Airmega 400S: Our Verdict

In the world of air purifiers, the Coway Airmega 400S stands out as a reliable choice, offering effective filtration and ease of use.

As you explore your options, the Airmega 400S should definitely be considered, especially if you want an air purifier that can handle a large area.

From personal experiences and user reviews, this air purifier appears to have a positive effect on those who are sensitive to airborne particles.

Users have noticed improvements in their health, such as reduced nasal congestion, after using this air purifier.

One of its main advantages is its quiet operation, which makes it perfect for use in living spaces and bedrooms.

When it comes to filter replacements, thankfully, the included filters are easy to change and provide excellent air-cleaning performance.

Plus, the stylish exterior design is a bonus that will fit seamlessly into any home decor.

To sum it up, if you’re in the market for an air purifier that offers high-quality filtration, quiet operation, and smart features without breaking the bank, the Coway Airmega 400S could be just what you need to improve the air quality in your home and help you breathe easier.

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