Levoit Core 400S-P vs Winix 5510

The Winix 5510 edges ahead overall on price and filtration depth, thanks to its washable pre-filter and optional ionizer stage. The Levoit Core 400S-P counters with a faster sensor, an on-unit display and Energy Star and ozone-free certification.

Filtration and certification trade places. The Winix 5510 has an extra washable pre-filter layer and an optional PlasmaWave ionizer, while the Levoit Core 400S-P is Energy Star and ozone-free certified and displays readings on its own screen.

The Levoit Core 400S-P's laser PM2.5 sensor is documented as reacting to cooking and dust within seconds, which owners call out specifically. The Winix 5510 also has a real PM2.5 sensor driving its auto mode, but the Levoit's is described as more responsive.

The Winix 5510 uses a washable pre-filter in front of its True HEPA and carbon layers, rated for about 12 months. The Levoit Core 400S-P's filtration is a single sealed 3-in-1 cartridge rated for about 8 months, and its pre-filter layer cannot be washed separately.

Buyers who want the lower price, an extra washable pre-filter layer and an optional ionizer stage should choose the Winix 5510.

Buyers who want the fastest-reacting sensor, an on-unit display showing live readings, and Energy Star plus ozone-free certification should choose the Levoit Core 400S-P.