Coway Airmega 400 Review
Image: Coway product photo via cowaymega.com
COWAY Air Purifier for Home Up to 3,120ft², Washable Pre-Filter and HEPA Filter for Smoke, Allergies, Pet Dander, Odor, AQI, Auto & Sleep Mode, Timer, 5yr Warranty, Airmega 400 White, AP-2015F
$629.99 (price as of 2026-11-07)
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CA Fire Supplies summarizes what owners report on Reddit. Follow official evacuation orders and air-quality guidance from your local authorities and CAL FIRE.
Reddit score
3.9 Based on 11 Reddit owner comments · Top 38% of 13 tracked air purifiers
| Owner sentiment | 4.2 | |
| Recommendations | 4.1 | |
| Spec score | Not rated | |
| Value | 3.0 |
How these are computed: methodology. Components without evidence show “Not rated” and their weight moves to the others.
Is the Coway Airmega 400 worth it?
Based on 11 Reddit owner comments, the Coway Airmega 400 scores 3.9 out of 5 (owner comments average 4.2 stars), and the theme owners raise most is filter cost (7 mentions).
Who it suits
- You care about room size (6 positive owner mentions)
- You care about filter cost (5 positive owner mentions)
- You care about noise (4 positive owner mentions)
Who should skip it
- Filter cost matters a lot to you (1 critical owner mention)
- Sensor auto matters a lot to you (1 critical owner mention)
What Reddit owners say
9 positive and 1 critical owner comments. Quotes link to the original Reddit comment.
Key specs
As listed on the Amazon product page we checked; missing fields are never estimated.
- [Coverage] Designed to clean spaces up to 3,120 sq. ft. in 60 minutes
- [HyperCaptive Filtration System] Combination of a pre-filter, active carbon filter, and HEPA Filter reduces 99.97% of 0.3 micron particles, including pollen and other allergens. It also reduces volatile organic compounds and odor
- [Smart Mode] With its Smart Mode feature, the Airmega automatically adapts to its surroundings by adjusting fan speeds based on the room's air quality; That means your unit is energy efficient without compromising effectiveness
- [Eco Mdoe] When the air quality in the room remains purified for 30 minutes or more in Eco Mode, the fan will turn off to conserve energy, kicking on again when pollution is detected
- [Sleep Mode] When the Airmega's built-in light and pollution sensors detect that the room has been dark and the air clean for 3 minutes, Sleep Mode reduces the purifier's noise and power consumption
| Power Source | Corded Electric |
|---|---|
| Control Method | Touch |
| Filter Type | HEPA Filter, Active Carbon Filter, Pre-Filter |
| Floor Area | 3120 square_feet |
| Noise Level | 22 db |
| Particle Retention Size | 0.3 micron |
| Controller Type | Touch |
| Wattage | 66 watts |
| Contaminant Filtration Capability | Dust, Odors, Pet Dander, Pollen, Volatile Organic Compounds (VOCs) |
| Special Features | Air Quality Monitor, Eco Mode, Filter Life Indicator, Smart Mode, Timer |
| Filter Class | MultiFilterManager |
| Software Update Supported to Date | unknown |
| Item Dimensions D x W x H | 14.8"D x 14.8"W x 22.8"H |
| Item Weight | 24.7 pounds |
| Specification Met | CARB Certified, ETL Certified, Energy Star Certified |
| Brand Name | Coway |
| Model Number | 111012 |
| Model Name | Airmega 400 |
| UPC | 826439150013 |
| Global Trade Identification Number | 00826439150013 |
| Number of Packs | 1 |
| Unit Count | 1 Count |
| Warranty Description | 5 year manufacturer's limited warranty |
| Included Components | Air Purifier, Filter Set, User Manual |
CA Fire Supplies is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Commissions never affect scores, rankings, or verdicts.
FAQ
Is the Coway Airmega 400 worth it?
Based on 11 Reddit owner comments, the Coway Airmega 400 scores 3.9 out of 5 (owner comments average 4.2 stars), and the theme owners raise most is filter cost (7 mentions).
What do Reddit owners complain about with the Coway Airmega 400?
The most common critical theme is filter cost (1 mentions).
How much does the Coway Airmega 400 cost?
It was $629.99 on Amazon when we checked on 2026-11-07. Prices change, so check Amazon for the current price.
Alternatives
Medify MA-40
3.5 (4 owner comments)
$449.99 (price as of 2026-11-07)
“If memory serves I have an ma-50 in the living room and ma-40 is each bedroom.”
Read review →
Coway Airmega 250
4.1 (7 owner comments)
$449.00 (price as of 2026-11-07)
“2 Airmega 250’s and 1 AP-1512 which is a smaller unit.”
Read review →3.7 (9 owner comments)
$349.00 (price as of 2026-11-07)
“Blue 211+.”
Read review →Keep deciding
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Last updated 2026-11-07. Amazon listing ASIN B01C9RIACG.