What is the best HEPA air purifier for allergies?

Best overall: Coway Airmega AP-1512HH Mighty. It’s a strong allergy pick for many bedrooms and medium rooms because it uses a true HEPA filter, has solid air-cleaning performance for its size, and includes an auto mode that adjusts fan speed as air quality changes.

If you need a larger-room pick, choose the Blueair Blue Pure 211i Max. If you want a more premium smart purifier with strong usability, choose the Levoit EverestAir. For a budget allergy purifier for smaller rooms, choose the Levoit Core 300S.

For allergies, room size matters as much as brand: pick a purifier rated for the room where you sleep, run it continuously at an appropriate fan speed, and replace filters on schedule.