Winix 5530 vs AT40

The Winix 5530 is better overall than the Winix AT40, particularly for larger rooms. It delivers considerably stronger particle filtration at both maximum power and quieter fan speeds, so it can clean the air more quickly without requiring you to run it at its loudest setting. The 5530 also uses a pellet-based activated carbon filter, which may be more effective at reducing household odors than the AT40's sheet-style filter. Both offer app connectivity and automatic fan adjustment, but the AT40 has a smaller footprint, making it easier to fit in bedrooms or other spaces with limited floor space.