Do air purifiers really help with allergies?

Yes — clinical studies show HEPA purifiers reduce airborne allergens by 50-80%, significantly improving allergy symptoms. Running a purifier in your bedroom overnight provides the most benefit since you spend 8 hours there.

How often should I replace the HEPA filter?

Most HEPA filters last 6-12 months. Carbon pre-filters need replacing every 3-6 months. Some purifiers have a filter life indicator. Running your purifier 24/7 shortens filter life — replace as recommended.

Best Air Purifiers for Allergies 2026