Levoit Core 400S-P vs Winix 5520

The Winix 5520 wins overall on value and raw cleaning power: it is the cheaper of the two, its AHAM Verifide smoke CADR is 253 CFM against 231 CFM, it covers up to 392 sq ft instead of 358 sq ft, and it layers a washable pre-filter on top of True HEPA and carbon. The Levoit Core 400S-P is the better pick if you want broader smart home support, an on-unit display and Energy Star efficiency.

Smart home reach versus filtration depth. The Levoit Core 400S-P works with Alexa, Google Home and Home Assistant and shows readings on an LED display; the Winix 5520 only supports Alexa and keeps its data in the app. In exchange, the Winix cleans a larger room and adds a washable pre-filter plus the PlasmaWave ionizer stage the Levoit does not have.

The Levoit Core 400S-P is certified ozone free. The Winix 5520 is not, because of its PlasmaWave ionizer stage, although that stage can be switched off in the app or on the unit. If you want a purifier that is ozone free by design with no setting to remember, the Levoit Core 400S-P is the safer choice, especially in a bedroom.

The Levoit Core 400S-P is the more efficient of the two, Energy Star certified and drawing 38 W against 50 W for the Winix 5520, so it costs less to run around the clock. On noise, the Winix 5520 goes lower in its quietest mode at 27 dB, while the Levoit is rated at 52 dB at full speed but drops to a comparably quiet level in sleep mode.

Buy the Levoit Core 400S-P if you want the purifier that fits a smart home best: Alexa, Google Home and Home Assistant support, an on-unit LED display for readings, Energy Star efficiency and ozone-free certification. Its 231 CFM AHAM Verifide CADR still handles rooms up to 358 sq ft, which covers most living rooms.

Buy the Winix 5520 if you want the most cleaning capacity for the money in a large room. Its AHAM Verifide 253 CFM CADR, 392 sq ft rating, washable pre-filter and very quiet 27 dB low setting make it the stronger workhorse, as long as Alexa-only voice control and the optional ionizer are acceptable to you.