Dyson Purifier Big+Quiet Formaldehyde BP03 vs Winix 5530

Winix 5530 for value and measured performance: an AHAM Verifide 253 CFM smoke CADR, a washable pre-filter, 23.5 dB at its quietest and a 2 year warranty. Dyson Purifier Big+Quiet Formaldehyde BP03 leads on sensing, adding VOC, CO2 and formaldehyde detection, and on a filter rated for 5 years.

One measures particles, the other measures the air. Winix 5530 senses PM2.5 and cleans it efficiently. Dyson Purifier Big+Quiet Formaldehyde BP03 adds formaldehyde, VOC and CO2 sensing with an LCD readout, and its catalytic stage destroys formaldehyde permanently rather than capturing it in a filter.

Winix 5530, rated down to 23.5 dB with a 45 W draw, which makes it easy to leave running in a bedroom. Dyson Purifier Big+Quiet Formaldehyde BP03 reaches 56 dB at full output but spreads its range over ten fan speeds, so it can be dialled in more finely than most purifiers.

Dyson Purifier Big+Quiet Formaldehyde BP03 is certified ozone free. Winix 5530 includes a PlasmaWave ionization stage, which can be switched off from the control panel, and testing bodies generally recommend doing so since the True HEPA filtration works fully without it.

Winix 5530 is AHAM Verifide at 253 CFM smoke CADR for 392 sq ft. Dyson quotes only air projection over 32 feet for the BP03, publishing no CADR, no room size at the AHAM air change rate and no AHAM certification, so there is no figure to set against the Winix's.

Anyone whose concern includes formaldehyde, VOCs or CO2, or who needs air moved across a large open floor and prefers a filter changed every few years. It has a 2 year warranty and a remote, but Winix 5530 provides certified particle cleaning at a tiny fraction of the price.