Our verdict
Pick the Winix 5520 if your room is larger and you want the lower price. Pick the Winix C545 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 C545 Air Purifier: 360 square feet.
Power draw. Winix 5520 Air Purifier states 50 watts; the other's maker page doesn't.
Filters. Winix 5520 Air Purifier: HEPA.
Filters. Winix C545 Air Purifier: Pre-Filter.
Price. When we checked, the Winix 5520 Air Purifier listed for less ($180 against $273); prices move, so check both buttons.
Side by side
| Specification | Winix 5520 Air Purifier | Winix C545 Air Purifier |
|---|---|---|
| Rated room size | 1,882 sq ft | 360 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 | 27 db |
| Power draw | 50 watts | Not stated by the maker |
| Filters | HEPA | Pre-Filter |
| 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.