Our verdict
Pick the Winix 5520 if your room is larger and running cost matters. Pick the Winix 9800 if it is the cheaper of the two on the day you buy.
The central trade-off
Rated room size. Winix 5520 Air Purifier: 1,882 square feet; Winix 9800 Air Purifier: 500 square feet.
Power draw. Winix 5520 Air Purifier: 50 watts; Winix 9800 Air Purifier: 95 watts.
Filters. Winix 5520 Air Purifier: HEPA.
Filters. Winix 9800 Air Purifier: HEPA.
Price. When we checked, the Winix 5520 Air Purifier listed for less ($180 against $300); prices move, so check both buttons.
Side by side
| Specification | Winix 5520 Air Purifier | Winix 9800 Air Purifier |
|---|---|---|
| Rated room size | 1,882 sq ft | 500 square feet |
| Smoke CADR | Not stated by the maker | 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 | 27 db | 26.2 db |
| Power draw | 50 watts | 95 watts |
| 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.