Our verdict
Pick the Honeywell HPA300 if your room is larger. Pick the Honeywell AllergenPlus HPA304 if it is the cheaper of the two on the day you buy.
The central trade-off
Rated room size. Honeywell HPA300 HEPA Air Purifier: 2250 square feet; Honeywell AllergenPlus HPA304 Air Purifier: 465 square feet.
Power draw. Honeywell AllergenPlus HPA304 Air Purifier states 80 watts; the other's maker page doesn't.
Filters. Honeywell HPA300 HEPA Air Purifier: HEPA.
Filters. Honeywell AllergenPlus HPA304 Air Purifier: HEPA.
Side by side
| Specification | Honeywell HPA300 HEPA Air Purifier | Honeywell AllergenPlus HPA304 Air Purifier |
|---|---|---|
| Rated room size | 2250 sq ft | 465 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 | Not stated by the maker | Not stated by the maker |
| Power draw | Not stated by the maker | 80 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.
Which should you choose?
Choose the Honeywell AllergenPlus HPA304 Air Purifier if
- It is the cheaper of the two on the day you buy