Coway Airmega Mighty AP-1512HH
#3 in Medium roomsFull review
A long-running favourite for a bedroom or living room that’s still cheap on Amazon. It has an air quality sensor but no app.
Amazon $154.98$154.98
3.4/5
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.
- 226 cfmSmoke CADR
- 350 sq ftRoom size
- $143.96/yearFilters
- 22 dBNoise
- 2 yearsWarranty
Check price at Amazon$99.99
Price checked October 22, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Rated for a 350 sq ft room (AHAM) for about $100
- Auto mode adjusts the fan to the air-quality sensor
- Quiet sleep mode, rated at 22-24 dB
- Two-year warranty
Cons
- Filter sets cost $36, and KNKA says to replace them every 3 to 6 months
- Uses more power than most purifiers its size
- No Wi-Fi or app unless you buy the APH4000WF
- KNKA publishes no noise figure for the top speed
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 | APH4000 |
|---|---|
| Performance | |
| Smoke CADR | 226 cfm |
| Dust CADR | 226 cfm |
| Pollen CADR | 244 cfm |
| PM2.5 CADR | 226 cfm |
| CADR certified by | AHAM Verifide |
| Room size (AHAM) | 350 sq ft |
| Coverage (maker) | 1,695 sq ft |
| Noise | 22 dB |
| Efficiency | |
| Efficiency (IEF) | 4.3 cfm/W |
| ENERGY STAR | No |
| Energy use | 304 kWh/year |
| Filters | |
| Filter | HEPA-type |
| Activated carbon | Yes |
| Replacement | APH4000LX |
| Replacement cost | $35.99 every 3 months |
| Yearly filter cost | $143.96/year |
| CARB certified (ozone) | Yes |
| Controls and build | |
| Air-quality sensor | air quality (type not stated) |
| Auto mode | Yes |
| Wi-Fi app | No |
| Fan speeds | 4 |
| Dimensions | 17.09 x 12.36 x 8.15 in |
| Weight | 9.7 lb |
| Warranty | 2 years |
Alternatives in this room size
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
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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