Choose Honeywell HPA300 for higher CADR and larger-room coverage. Choose Honeywell HPA125B if you want lower noise.
Which purifier has higher CADR?
The Honeywell HPA300 has a smoke CADR of 300 CFM versus 250 CFM for the Honeywell HPA125B, a difference of 20%.
Which purifier is quieter?
Honeywell HPA125B is quieter (21 vs 53 dB).
Which purifier covers a larger room?
Honeywell HPA300 fits a larger room (about 465 vs 388 sq ft recommended from CADR).
Which purifier has better smart features?
Neither lists Wi-Fi or app control in our sources.
Which purifier has better filtration?
Honeywell HPA300 lists True HEPA; Honeywell HPA125B lists HEPA.
Bottom line
Choose Honeywell HPA300 for higher CADR and larger-room coverage. Choose Honeywell HPA125B if you want lower noise.
| Metric | Honeywell HPA300 | Honeywell HPA125B | Difference / Winner |
|---|---|---|---|
| Smoke CADR | 300 CFM | 250 CFM | Honeywell HPA300 (+20%) |
| Recommended room size | 465 sq ft | 388 sq ft | Honeywell HPA300 (+20%) |
| Manufacturer claimed coverage | — | 530 sq ft | — |
| Minimum noise | 53 dB | 21 dB | Honeywell HPA125B |
| Filter type | True HEPA | HEPA | — |
| Wi-Fi / app | No | No | — |
| Weight | — | 2.1 lb | — |