A quiet, good-looking purifier for a small bedroom or nursery. Bigger rooms need more airflow for the money.
Amazon $186.29The Coway Airmega 150 rates 3.4 among medium rooms air purifiers; the Levoit Core 300 rates 3.1 among small rooms ones. The Levoit Core 300 costs $96.30 less ($89.99 vs $186.29).

A simple, proven purifier for a bedroom or small living room. Buy the Core 300S only if you want auto mode and app control.
Amazon $89.99Prices 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.
Scores side by side
These two sit in different room size classes (medium rooms and small rooms), and each is scored against the reference points for its own class, so a rating says how well each does among its own room size peers. How we rank explains each factor.
| Factor weight | Coway Airmega 150 | Levoit Core 300 |
|---|---|---|
| Overall rating | 3.4/5 | 3.1/5 |
| Value 25% | 45 $1.22 per cfm of smoke CADR | 91 $0.63 per cfm of smoke CADR |
| Filter cost 20% | 68 $49.99 a year in filters | 54 $59.98 a year in filters |
| Quiet 20% | 78 48.3 dB at top speed (maker rating) | 37 54.5 dB at top speed (maker rating) |
| Efficiency 15% | 50 efficiency not certified (neutral score used) | 9 2.7 cfm per watt |
| Auto mode 10% | 70 particle sensor, auto mode | 0 no air-quality sensor or app |
| Warranty 10% | 0 1-year warranty | 25 2-year warranty |
Specifications
| Coway Airmega 150 | Levoit Core 300 | |
|---|---|---|
| Performance | ||
| Smoke CADR | 153 cfm | 143 cfm |
| Dust CADR | 161 cfm | 153 cfm |
| Pollen CADR | 220 cfm | 167 cfm |
| PM2.5 CADR | - | 148 cfm |
| CADR certified by | Maker (AHAM AC-1 test) | AHAM Verifide |
| Room size (AHAM) | - | 222 sq ft |
| Coverage (maker) | 214 sq ft | - |
| Noise | 20 to 48.3 dB | 24 to 54.5 dB |
| Efficiency | ||
| Efficiency (IEF) | - | 2.7 cfm/W |
| ENERGY STAR | No | No |
| Energy use | - | 317 kWh/year |
| Power at top speed | 35 W | 56 W |
| Filters | ||
| Filter | HEPA | HEPA |
| Activated carbon | Yes | Yes |
| Replacement | AP-1019C-FP filter set | Core 300 Series Original Filter |
| Replacement cost | $49.99 every 12 months | $29.99 every 6 months |
| Yearly filter cost | $49.99/year | $59.98/year |
| Ionizer | No | No |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | particle | None |
| Auto mode | Yes | No |
| Wi-Fi app | No | No |
| Fan speeds | 3 | 3 |
| Dimensions | 18.5 x 13.4 x 6.5 in | 14.2 x 8.7 x 8.7 in |
| Weight | 12.1 lb | 7.9 lb |
| Warranty | 1 years | 2 years |