Levoit Core 400S

The Core 400S is the sweet spot in Levoit's range for allergy sufferers with bigger rooms. Its three-stage filter (pre-filter, H13 HEPA and activated carbon) draws air through a 360-degree base and pushes clean air up and out, clearing a large space quickly on higher settings. With a CADR of around 440 m3/h, it can cycle the air in a typical living room several times an hour; Levoit rates it for roughly 37 m2 at an allergy-appropriate air-change rate (larger figures you'll see quote a lower change rate). The VeSync app adds scheduling, an auto mode driven by the built-in PM2.5 sensor and a real-time air-quality number, while a genuinely quiet sleep mode dims the display. It isn't a sealed system to Dyson's standard and the styling is plain, but on cost-per-clean-air it's excellent.