Coway Airmega 350
#11 in Large roomsFull review
For big rooms where you want high certified airflow and low running costs without app features.
Amazon $339$339
The Coway Airmega 350 is the better air purifier overall, rated 3.4 to 3.0. The Coway Airmega 350 leads on value, efficiency and filter cost. The Levoit EverestAir wins on auto mode and warranty. The Coway Airmega 350 costs $160.99 less ($339 vs $499.99).
Levoit EverestAir
#13 in Large roomsFull review
A premium Levoit for a large room where floor space is tight. The Core 600S cleans a bit more air for less money if you have the floor space.
Amazon $499.99$499.99
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Coway Airmega 350 for value ($0.94 per cfm of smoke CADR vs $1.41 per cfm of smoke CADR), efficiency (6.3 cfm per watt vs 5.3 cfm per watt) and filter cost ($79 a year in filters vs $99.99 a year in filters).
- Choose the Levoit EverestAir for auto mode (PM1/PM2.5/PM10 laser sensor and Wi-Fi app vs PM laser sensor, auto mode) and warranty (2-year warranty vs 1-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large rooms air purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Coway Airmega 350 | Levoit EverestAir |
|---|---|---|
| Overall rating | 3.4/5 | 3.0/5 |
| Value 25% | 57 $0.94 per cfm of smoke CADR | 17 $1.41 per cfm of smoke CADR |
| Filter cost 20% | 83 $79 a year in filters | 74 $99.99 a year in filters |
| Quiet 20% | 35 54.7 dB at top speed (maker rating) | 27 56 dB at top speed (maker rating) |
| Efficiency 15% | 54 6.3 cfm per watt | 41 5.3 cfm per watt |
| Auto mode 10% | 70 PM laser sensor, auto mode | 100 PM1/PM2.5/PM10 laser sensor and Wi-Fi app |
| Warranty 10% | 0 1-year warranty | 25 2-year warranty |
Specifications
| Coway Airmega 350 | Levoit EverestAir | |
|---|---|---|
| Performance | ||
| Smoke CADR | 360 cfm | 354 cfm |
| Dust CADR | 378 cfm | 373 cfm |
| Pollen CADR | 450 cfm | 431 cfm |
| PM2.5 CADR | 369 cfm | 363 cfm |
| CADR certified by | ENERGY STAR | AHAM Verifide |
| Room size (AHAM) | 558 sq ft | 549 sq ft |
| Coverage (maker) | 2,640 sq ft | - |
| Noise | 21.5 to 54.7 dB | 24 to 56 dB |
| Efficiency | ||
| Efficiency (IEF) | 6.3 cfm/W | 5.3 cfm/W |
| ENERGY STAR | Yes | No |
| Energy use | 344 kWh/year | 404 kWh/year |
| Power at top speed | 62 W | 70 W |
| Filters | ||
| Filter | HEPA | HEPA |
| Activated carbon | Yes | Yes |
| Replacement | Airmega 350 Fresh Starter Plus filter | EverestAir-P replacement filter |
| Replacement cost | $79 every 12 months | $99.99 every 12 months |
| Yearly filter cost | $79/year | $99.99/year |
| Ionizer | No | No |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | PM laser | PM1/PM2.5/PM10 laser |
| Auto mode | Yes | Yes |
| Wi-Fi app | No | Yes |
| Fan speeds | 3 | 3 |
| Dimensions | 23.2 x 12.0 x 12.0 in | 23.2 x 18.9 x 8.5 in |
| Weight | 17.2 lb | 20.7 lb |
| Warranty | 1 years | 2 years |