Our verdict
Pick the Coway Airmega 350 if running cost matters and you want the lower price. Pick the Coway Airmega 400 if your room is larger.
The central trade-off
Rated room size. Coway Airmega 400: 3,120 sq ft; Coway Airmega 350: 2,640 sq ft.
Smoke CADR. Coway Airmega 350 states 352 CFM; the other's maker page doesn't.
Power draw. Coway Airmega 350: 62 W; Coway Airmega 400: 66 W.
Filters. Coway Airmega 350: HEPA.
Filters. Coway Airmega 400: HEPA.
Price. When we checked, the Coway Airmega 350 listed for less ($339 against $649); prices move, so check both buttons.
Side by side
| Specification | Coway Airmega 350 | Coway Airmega 400 |
|---|---|---|
| Rated room size | 2,640 sq ft | 3,120 sq ft |
| Smoke CADR | 352 CFM | Not stated by the maker |
| CADR | Not stated by the maker | Not stated by the maker |
| Quietest setting | Not stated by the maker | Not stated by the maker |
| Noise | 21.5 dB | 22 dB |
| Power draw | 62 W | 66 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.