Coway Airmega 150
#4 in Medium roomsFull review
A quiet, good-looking purifier for a small bedroom or nursery. Bigger rooms need more airflow for the money.
Amazon $186.29$186.29
2.9/5
A mid-to-large-room HEPA purifier with cheap filters, for living rooms where noise isn’t a concern.
- 239 cfmSmoke CADR
- 370 sq ftRoom size
- $80.34/yearFilters
- 46 to 66 dBNoise
Check price at Amazon$249.99
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Certified 239 CFM handles a 370 sq ft room
- Filters cost about $40 and include a carbon layer
- Lifetime warranty when registered with genuine filters
Cons
- Loud for its size at 66 dB on top speed
- No sensor or auto mode
- Filters may need changing every 4-6 months under heavy use
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its room size. How we rank explains each one.
Specifications
| Model number | MA-40 |
|---|---|
| Performance | |
| Smoke CADR | 239 cfm |
| Dust CADR | 231 cfm |
| Pollen CADR | 240 cfm |
| PM2.5 CADR | 235 cfm |
| CADR certified by | AHAM Verifide |
| Room size (AHAM) | 370 sq ft |
| Coverage (maker) | 1,793 sq ft |
| Noise | 46 to 66 dB |
| Efficiency | |
| ENERGY STAR | No |
| Filters | |
| Filter | H13 HEPA 3-in-1 (pre-filter, carbon, HEPA) |
| Activated carbon | Yes |
| Replacement | MA-40 replacement filter |
| Replacement cost | $40.17 every 6 months |
| Yearly filter cost | $80.34/year |
| CARB certified (ozone) | Yes |
| Controls and build | |
| Air-quality sensor | None |
| Auto mode | No |
| Wi-Fi app | No |
| Fan speeds | 3 |
| Dimensions | 22 x 10.9 x 9.9 in |
| Weight | 15 lb |
Alternatives in this room size
KNKA APH4000
#5 in Medium roomsFull review
A low-priced purifier for medium rooms up to about 350 sq ft. It has a sensor-driven auto mode, but filter costs add up if you follow KNKA’s replacement schedule.
Amazon $99.99$99.99
Sharp FP-K50UW Plasmacluster
#6 in Medium roomsFull review
A medium-room HEPA and carbon purifier with long-life filters, for buyers who prefer simple manual controls.
Amazon $179.99$179.99
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