Do HEPA air purifiers actually help with pet allergies?

Yes. True HEPA filters capture 99.97% of particles down to 0.3 microns, which includes pet dander, dust mite allergens, and pollen. Studies show that running a HEPA purifier in the bedroom significantly reduces airborne allergen levels within 30 to 60 minutes. For best results, run it continuously on a low setting rather than turning it on only when symptoms flare up.