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Air Purifier for Dust Allergies – Coway Airmega 400 Air Purifier

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Set Alert for Product: Coway Airmega 400 Smart Air Purifier with 1,560 sq. ft. Coverage - $649.00
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☑ Real-time air quality monitoring
☑ Hands-off Operation mode (Smart Mode)
☑ Notifications
☑ Powerful air dust cleaner
☑ Auto-adjust fan speed
☑ Energy star rated
☑ Wi-fi connection

Last updated on May 21, 2020 7:35 am
Air Purifier for Dust Allergies – Coway Airmega 400 Air Purifier
Air Purifier for Dust Allergies – Coway Airmega 400 Air Purifier

$749.00 $649.00

Score & Analysis

Features Score



Price Range : Greater Than $500

Group Rank : #4( out of 7 )


Average score in the group


Best score in the group



Overall Rank : #9( out of 85 Air purifier )


Average score in Air purifier


Best Score in Air purifier



Features Group This
Best Average Remarks Best Average Remarks
CADR (Clean air delivery rate) 210 150 below average
N/A 184.33 below average
CADR Dust 500 306.8 Above average
350 164.7 Above average
CADR tobocco smoke 500 303.8 Above average
350 163.45 Above average
CADR pollen 640 345 Above average
350 176.64 Above average
Air changes per hour 5 4 below average
N/A 2.8 below average
Energy consumption [Watt] 56 71 Above average
N/A 65.6 below average
Room Size 1560 735.43 Best
1560 332.98 Best
Noise level [db]-Air purifier 40 48.4 Above average
N/A 41.09 below average
Airpurifier weight [lb] 8.62 24.65 below average
24.7 13.22 Above average
Warranty [Months] 60 54 Best
60 42 Above average


There is no denying that a lot of us do not have the time to improve the quality of air in our homes even when we truly want to. As a result of that, we simply rely on our HVAC filters and the occasional vacuuming to clear out the dust, pet hair, smoke, and other air debris. While these two things slowly improve the air quality of homes, there are better, faster and incredibly easier air dust cleaners you can use in other to have fresh and clean air in your indoor environment.

The Coway  Airmega 400 air purifier is one of the purifiers out there and it is from one of the biggest industries known for producing air purifiers. It is an efficient air purifier that will ensure that even individuals with airborne allergies can walk freely in your house without fear. Its air purifying prowess aside, Coway Airmega 400 is available in silver/graphite and white model and the elegant design makes it a fancy and attractive addition to your home. There are loads of impressive features on the smart air purifier and rightly so considering it is also one of the most expensive air purifiers out there.

Features of Coway Airmega 400:

Let us take a look at the most amazing features below:

Real-time air quality monitoring

This is one of the most impressive things about the Coway Airmega 400. It is equipped with capabilities to monitor pollution in its environment thus allowing you to know the air quality in real-time. With this, people who suffer from asthma and allergy can relax without having to blindly rely on the performance of an air purifier. There is an air quality indicator at the front of the air purifier where you can easily tell how clean/healthy the air you are breathing is.

Hands-off operation Mode (Smart Mode)

This is one of the things that sets the Coway Airmega 400 apart from other air purifiers. All you have to do enable the Smart mode via the touch control panel on your purifier. The purifier will then automatically adjust and regulate its speed based on what it detects in the room it is placed in. There is a Sleep Mode which is activated when the purifier’s sensors detect low brightness/darkness in the room. When the air purifier is in sleep mode, it will reduce power consumption and noise.

Another mode that is available when the Smart mode is enabled is Eco Mode. The purifier also Auto-adjust fan speed when in Smart Mode based on the conditions detected by the sensors.

Powerful Two-stage air filtration

This air purifier combines both a HEPA filter and an Activated Carbon filter to ensure that 99.7% airborne pollutants and particles are eliminated. The implication of this is that from pet hair which can easily be seen with the naked eyes to dust that cannot be seen, every debris is removed. There are filters on both sides of the air purifier to guarantee optimal cleaning of the air in the room.

Touch screen Control Panel

The air purifier, unlike some other air purifiers, does not have a smartphone app. However, it has a touchscreen control panel where you can control the purifier without the need of any manual control or dial. The onboard touchscreen control panel is easy to use and does not require technical knowledge to operate.

Energy Star certified

The Coway Airmega 400 smart air purifier is also energy efficient and does not consume too much power as long as it is set to the normal setting. The average power consumption of the air purifier is 66 watts.

When in Smart Mode, the air Purifier stops working if it detects a low pollution level for 10 minutes running. It would only automatically startup if the pollution level changes. This invariably helps reduce power consumption.

It comes with a Timer that you can use to even reduce the amount of power the Purifier consumes. The Timer allows you to set the number of hours you want the air purifier to stay work before automatically turning itself off.

NOTE: There is a model of the Coway Airmega 400 air purifier that uses Wi-Fi but it is slightly more expensive than the normal one. You can consider using it if you want more convenience.

Air Purifier for Dust Allergies – Coway Airmega 400 Air Purifier Prices

Price History

Price history for Coway Airmega 400 Smart Air Purifier with 1,560 sq. ft. Coverage
Latest updates:
  • $649.00 - April 7, 2020
  • $587.00 - March 2, 2020
  • $649.00 - February 15, 2020
  • $539.00 - January 31, 2020
  • $541.99 - January 29, 2020
  • $542.34 - January 27, 2020
  • $500.16 - January 20, 2020
  • $310.67 - December 9, 2019
Since: November 24, 2019
  • Highest Price: $649.00 - February 15, 2020
  • Lowest Price: $310.59 - December 5, 2019

Additional information

Specification: Air Purifier for Dust Allergies – Coway Airmega 400 Air Purifier



Mold spores



Bacteria and viruses

Chemical and gas fumes

Odros and smells

Pet dender

CADR rating

CADR (Clean air delivery rate)




CADR tobocco smoke


CADR pollen


Air changes per hour


Energy consumption [Watt]


Room Size


Noise level [db]-Air purifier


Filters & Sensors
Hepa fliter

True hepa Filter

Air quality sensors

Carbon filter

Filter replacement indicators


Washable pre filter

Other useful
Carrying handle


Digital control

Night light

Programmable timer

Technology-Air purifier
0.3µm particle removal (%)


Antimicrobial treatment

Ozone free

Photocatalytic oxidation

Plasma wave technology

Airpurifier Height [inch]


Airpurifier Length [inch]


Airpurifier weight [lb]


Airpurifier Width [inch]


Warranty [Months]


Wireless controls

Amazon Alexa-Air

Google Assistant-Air

App Control-Air

Remote Control-Air

Voice Control-Air


How loud is this air purifier?

This Air purifier can work without you even noticing it when in sleep mode. When it is not in Sleep mode, it has about 39 decibels on low settings and 55 decibels on the highest settings.

Does this air purifier remove pet hair from my room?

Yes! The Coway Airmega 400 will remove any pet hair in the room. Its filter can remove up to 99.97% air debris/particles from the room down to 0.3 microns.

How often do the filters need changing?

The filters of this air purifier are a bit pricey. The good thing about them is that you only need to change them yearly (12 months).

Does the Coway Airmega have a Pre-filter? Is it Washable?

Yes. It has a pre-filter that is washable but it has to be replaced after 12 Months

What sort of maintenance practice is needed?

This air purifier does not require a lot of maintenance. It is easy to clean and comes with washable pre-filters which you only need to clean when the filter indicator says you should. However, you have to clean the Pollution sensor and vents every two months with a soft dry cloth.

Does the pre-filter have a lifespan?

Yes. The pre-filter can last for 12 months after which it needs replacing.

Best spot to place the Coway Airmega 400 air purifier to ensure optimal effectiveness?

The best spot to place this air dust cleaner to ensure optimal effectiveness is any area that receives unrestricted airflow. This will allow the purifier to remove air pollutants faster.

What other particles/debris does this air purifier remove apart from dust?

It can also remove pollen, bacteria, smoke, pet dander and hair, Mold and even airborne viruses.

How heavy is the Coway Airmega 400?

The machine weighs about 25 pounds. It has handles that make it easier to lift from one room to another.

Does it have any special features?

The main special feature this air purifier has is the Smart Mode where the purifier automatically regulates based on the conditions detected by its sensors.

Is this air purifier for everyone?

Yes, this filter can be used by anyone who wants to breathe fresh and clean air in their home

Is it Energy efficient?

Yes, it is. This air purifier is even energy star certified

How big is Coway Airmega 400’s coverage?

Coway Airmega 400 covers up to 1,560 square feet

Does it have a smartphone App?

No, it does not.

How long is the warranty?

The motor and electronic parts of the purifier comes with 5-years manufacturer warranty

What kind of filter does Coway Airmega 400 use?

The filter is a combination of Green-True HEPA filter and activated carbon filter

How many fan speed does this air purifier have and are they adjustable?

There are 4 fan speeds. They can be adjusted based on user preference

Is Coway Airmega 400 Ozone free?

Yes, it is ozone free and has zero ozone emission. It is a safe and environmentally friendly air dust cleaner for homes.

Can the machine automatically turn off?

Yes! However, for that to happen, you need to set how many hours you want it to work before turning off using the Timer features on the control panel.

Does it have indicator lights that alert me when I need to change or wash the filters?

Yes, the purifier has a good notification system that monitors the performance of the various components in it and notifies you when one needs to be changed or replaced.

Can I control it with a remote?

No, it does not have a remote control.

What is the CADR value of this air purifier?

The following are the CADR values of Coway Airmega 400 air purifier: Pollen Score – 350, Smoke Score – 350 and Dust Score – 350.

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