1 / 7Coway Airmega 250S Smart HEPA Air Purifier
The Coway Airmega 250S is a corded smart air purifier with washable pre-filter, activated carbon and HEPA filtration. Its listed coverage is up to 930 sq. ft. in 30 minutes or 1,860 sq. ft. in 60 minutes, so the larger figure represents a slower cleaning interval rather than the same turnover rate.
At a glance
- The stated coverage is up to 930 sq. ft. in 30 minutes or 1,860 sq. ft. in 60 minutes.
- The filtration system combines a washable pre-filter, activated carbon filter and HEPA filter.
- The listing claims reduction of 99.97% of 0.3-micron particles and 99% of volatile organic compounds and odor.
- The IoCare app is listed for air-quality monitoring, filter notifications, scheduling and control of speed and smart mode.
- An air-quality monitor supports automatic adjustment of purification, while Rapid Mode is described as running at maximum power when needed.
Reference price: $449.00
Price checked: Nov 14, 2026
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Pros and cons
Pros
- The three-stage filter combination addresses particles and odors, and its pre-filter is washable.
- App control and listed Alexa and Google Assistant compatibility offer several ways to operate it.
- The listing gives different coverage rates by cleaning interval, helping buyers compare its use in large rooms.
Cons
- Wi-Fi reliability and app quality receive mixed customer feedback, which may reduce the usefulness of its smart controls for some owners.
- Customer feedback also reports a low-pitched hum, despite some describing the purifier as relatively quiet.
Technical specifications
16 specifications| Brand | Coway |
|---|---|
| Model | Airmega 250S |
| Filter types | HEPA Filter, Carbon Filter, Washable Pre-Filter |
|---|---|
| Listed floor area | 1860 square_feet |
| Particle retention size | 0.3 micron |
| Contaminants listed | Dust, Odors, Pet Dander, Pollen, Volatile Organic Compounds (VOCs) |
| Control methods listed | App, Voice |
|---|---|
| Special features | Air Quality Monitor, Filter Life Indicator, Smart Mode, Wi-Fi Enabled |
| Power configuration | Corded Electric |
|---|---|
| Power consumption listed | 64 watts |
| Noise level listed | 22 db |
| Dimensions listed | 8.3"D x 18.5"W x 19.7"H |
|---|---|
| Weight listed | 20.5 pounds |
| Color | Warm Gray |
| Certifications listed | CARB Certified, ETL Certified |
|---|---|
| Warranty description | 3 year manufacturer's limited warranty |
What to know before buying
- Coverage figures are time-dependent: the listing claims 930 sq. ft. in 30 minutes and 1,860 sq. ft. in 60 minutes. The separate 1,860-square-foot floor-area specification does not state an interval, so use the stated timed figures when sizing a room. The listed 22 db noise level has no operating mode specified.
What’s in the box
Included- Air purifier
- Filter set
- User manual
Who is it for?
A good fit for
- Buyers seeking particle and odor filtration with a washable pre-filter for a large room.
- People who want app-based monitoring, scheduling and smart-mode controls, provided they are comfortable with reported connectivity concerns.
- Households looking for an air-quality indicator and automatic adjustment rather than only manual speed selection.
Less suited to
- Buyers who need dependable Wi-Fi or app performance as a core requirement.
- Anyone choosing solely by the 1,860-square-foot figure without accounting for the stated 60-minute cleaning interval.
Customer reviews on Amazon
- 5 stars
70% 70% - 4 stars
10% 10% - 3 stars
8% 8% - 2 stars
3% 3% - 1 star
9% 9%
Customer feedback describes improved air quality, especially around dust and pet dander, and positive impressions of appearance and ease of cleaning. Reports about functionality and noise are mixed, including both relatively quiet operation and a low-pitched hum. Wi-Fi and app problems are a notable concern, while value opinions also differ. For buyers relying on remote monitoring and scheduling, connectivity reports matter because these controls are part of the listed smart feature set. The aggregate ratings lean positive overall but include a meaningful spread across lower star categories, so they do not erase those practical concerns.
Positive themes
- Customers report improvements in air quality, particularly for dust and pet dander.
- Customers appreciate the appearance and ease of cleaning.
Negative themes
- Customer feedback reports Wi-Fi connection problems and app malfunctions.
Mixed feedback
- Feedback on functionality, noise level, app quality and value for money is mixed. Some describe it as effective and relatively quiet, while others report a low-pitched hum or poor app experience.
Frequently asked questions
How much area does the Airmega 250S cover?
The listing claims it can clean up to 930 sq. ft. in 30 minutes or up to 1,860 sq. ft. in 60 minutes. Consider the interval as well as room area when choosing.
What filters does it use?
The listed filter types are a washable pre-filter, carbon filter and HEPA filter. The feature description identifies the carbon filter as activated carbon.
Can it be controlled by phone or voice?
The listing identifies app and voice controls, with Amazon Alexa and Google Assistant listed as controller types. Customer feedback includes reports of Wi-Fi and app problems, so smart-control reliability is not assured.
What is included?
The manufacturer contents list names the air purifier, filter set and user manual.
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