Our verdict
Pick the Coway Airmega 300 if running cost matters. Pick the Coway Airmega 350 if you want the lower price.
The central trade-off
Smoke CADR. Coway Airmega 350 states 352 CFM; the other's maker page doesn't.
Power draw. Coway Airmega 300: 57 W; Coway Airmega 350: 62 W.
Filters. Coway Airmega 300: HEPA.
Filters. Coway Airmega 350: HEPA.
Price. When we checked, the Coway Airmega 350 listed for less ($339 against $549); prices move, so check both buttons.
Side by side
| Specification | Coway Airmega 300 | Coway Airmega 350 |
|---|---|---|
| Rated room size | 2,513 sq ft | 2,640 sq ft |
| Smoke CADR | Not stated by the maker | 352 CFM |
| CADR | Not stated by the maker | Not stated by the maker |
| Quietest setting | Not stated by the maker | Not stated by the maker |
| Noise | Not stated by the maker | 21.5 dB |
| Power draw | 57 W | 62 W |
| Filters | HEPA | HEPA |
| Warranty | Not stated by the maker | Not stated by the maker |
Values are the makers' published specifications. "Not stated" means the maker doesn't publish it.