Air Purifiers for Allergies
For allergies, choose a true HEPA purifier sized to give the room four to five air changes an hour, and run it continuously in the room where you spend the most time, usually the bedroom. HEPA filters capture pollen, dust mite debris and pet dander that pass through them.
What matters for allergy relief
- True HEPA, not "HEPA-type": true HEPA is rated to capture 99.97% of particles at 0.3 microns. Pollen grains are far larger, roughly 10 to 100 microns.
- Pollen and dust CADR: these are the AHAM numbers that apply. Aim for a CADR at or above two-thirds of the room's square footage.
- Sealed design: a filter that seals tightly in its housing keeps air from bypassing the media.
- Quiet low setting: you will run it all night, so check the dB rating on low.
- Washable pre-filter: it catches pet hair and lint and extends HEPA life.
Narrow down with Air Purifiers for Pets for dander and hair, or Air Purifiers for Mold for damp rooms and basements.
FAQs
Do air purifiers help with allergies?
HEPA air purifiers reduce airborne allergens such as pollen, pet dander and dust particles in the room where they run. They cannot remove allergens that have settled on bedding, carpets or furniture, so allergists usually suggest combining a purifier with regular washing of bedding and vacuuming with a HEPA vacuum.
Where should I put an air purifier for allergies?
Put it in the bedroom, because most people spend seven or more hours a night there. Place it a few feet from walls and furniture so air can flow in and out freely, and keep doors and windows closed during high pollen counts so the purifier is not fighting a constant stream of outdoor air.
Should I run an air purifier all day for allergies?
Yes. Purifiers work by repeatedly cycling the room's air, so allergen levels climb back within hours of switching off. Running on a low or auto setting around the clock is typical. Modern purifiers use roughly 10 to 60 watts on medium settings, so check the wattage on the spec sheet to estimate cost.
