Coway (brand store)white $449
Shippingabout 3–7 days
Returns–
Coway Airmega 250S
Rank 8 of 13 robots for large rooms in our ranking, tested by .in our ranking, tested by
Score 4.6 out of 10
Lab tests, 60% of the score: no lab has tested it.
Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.
Features, 15%: 4.6, 32 of the 69 points for the facts the maker states.
Price does not count, so a discount never lifts a model. Only robots a lab has tested are ranked.
The highest score today is 8.4.
Is the Coway Airmega 250S right for your home? Find out in 7 questions →
Before you buy, compare it with 2 recommended alternatives
Beside it, a model with the same kind of station that scores about the same for at least 25% less, and one that scores clearly higher for at most 20% more, where we find them on sale today.
Green is the best of these 3, also when they share the lead.
| This model Coway Airmega 250S | Much better, not pricier Levoit Core 400S-P Best on 2 facts | Nearly as good, 44% cheaper Medify MA-40 | |
|---|---|---|---|
| Price and ranking | |||
| Lowest price | $449Coway (brand store) | $219Levoit (brand store) best | $249Medify Air (brand store) |
| Score | best | ||
| Rank | rank 8 of 13 for large rooms | rank 1 of 13 for large rooms | rank 9 of 13 for large rooms |
| Customer rating | – | – | – |
| Station | |||
| Room size same on all | large rooms | large rooms | large rooms |
| Size, noise and age | |||
| On the market since | September 2021 | June 2023 | April 2020 |
Facts as the maker states them. A dash means the maker does not name it. Each model’s page gives the source of every fact. Noise is the maker’s own figure, so we do not judge it, and a customer rating only counts from 20 reviews.
Prices per store
On October 15, 2026 the lowest price for the Coway Airmega 250S is $449 at Coway (brand store), shipping to the United States included. In our ranking it is rank 8 of 13 for large rooms, with a score of 4.6 out of 10.
All prices include shipping to the United States. Sales tax is added at checkout. We may earn a commission when you buy through these links. It never changes our ranking.
Coway (brand store)white Price history
Lowest price per day
Lowest since Oct 14$449
Highest since Oct 14$449
Price drops since Oct 140no drop seen yet
Coway Airmega 250S specifications
The numbers that matter first, then every fact by group. As published by the maker or the store we read it from.
Coway · on the market since September 2021
Clean air delivery rate (CADR)249 cfm
Room size we compare on380 ft²
Noise at the lowest speed22 dB
Filter life6 months
Power at the highest speed64 W
Running cost: Filters: about $89 a year at today’s prices.
Consumables: The filter lasts about 6 months.
Cleaning performance 6 facts
- Clean air delivery rate (CADR)
How much clean air the purifier delivers an hour, measured with smoke, dust and pollen. A higher figure cleans a bigger room or the same room faster.
- 249 cfm (423 m³/h)
- CADR measured to
The test the CADR comes from. AHAM AC-1 and the DOE test are independent and comparable. A maker's own test is not.
- Not stated
- CADR for smoke
The CADR measured with tobacco smoke, the finest of the three test particles. It is the figure to read for wildfire smoke.
- 249 cfm (423 m³/h)
- CADR for dust
The CADR measured with dust.
- 261 cfm (443 m³/h)
- CADR for pollen
The CADR measured with pollen.
- 230 cfm (391 m³/h)
- Room size we compare on
The room size where the purifier changes the air 4.8 times an hour under a 2.5 m ceiling, worked out from its CADR. We use it so every model is compared on the same rule.
- 380 ft² (35 m²)
Filter 1 fact
- Activated carbon filter
A filter of activated carbon that takes out smells and some gases. It does not catch particles.
- yes
Running costs 1 fact
- Filter life
How long the maker says a filter lasts, in months of normal use. A filter that is spent cleans less.
- 6 months
Noise and power 3 facts
- Noise at the lowest speed
The sound level at the lowest speed, as the maker measures it.
- 22 dB
- Noise at the highest speed
The sound level at the highest speed, as the maker measures it.
- 54 dB
- Power at the highest speed
The power the purifier draws at its highest speed.
- 64 W
Air quality sensing 1 fact
- Automatic mode
The fan speed follows the air quality the sensor reads.
- yes
Smart features and warranty 1 fact
- App control
- Wi-Fi
Extras 1 fact
- CARB certified
Certified by the California Air Resources Board as making little ozone.
- yes
Sources: cowaymega.com · ww2.arb.ca.gov
Our score
Confidence: medium. One lab and fewer than 300 owners’ ratings. The highest score today is 8.4.
-
Lab tests 60%–
Left out, so the other parts count for more.
-
Owners’ ratings 25%–
Owners’ ratings, 25%: none yet at the stores that ship to the United States, so this part is left out and the others count for more.
-
Features 15%4.6
32 of 69 points for the facts the maker states.
- Price never countsA sale can’t lift a model. Today’s lowest price sits beside the score, checked every morning.
- No test, no rankOnly robots a lab has tested are ranked. The rest get a provisional score.
- Reviewers beside, not insideReviewers’ picks are shown next to the score and do not count in it.
Frequently asked questions about the Coway Airmega 250S
What size of room is the Coway Airmega 250S for?
The Coway Airmega 250S is sized for a room of about 380 ft², the room size we compare it on. Its clean air delivery rate (CADR) is 249 cfm.
How often does the Coway Airmega 250S need a new filter?
The maker gives the filter a life of 6 months.
How loud is the Coway Airmega 250S?
The maker states 22 dB at the lowest speed and 54 dB at the highest.
Does the Coway Airmega 250S make ozone?
It is CARB certified, which means it stays under California’s limit of 50 parts per billion of ozone.
Is the Coway Airmega 250S good for wildfire smoke?
Its CADR for smoke is 249 cfm. A higher number clears smoke from a room faster, so compare it with the size of your room.
The maker
Coway
Coway began in Korea in 1989 and describes itself as a global company with three decades focused on health. In the United States it sells Airmega air purifiers, Bidetmega bidet toilet seats and Aquamega water purifiers.
