Key Features That Matter
Look for a True HEPA filter, which captures 99.97% of particles down to 0.3 microns. Activated carbon reduces odors and gases. Check the Clean Air Delivery Rate (CADR) for smoke, dust, and pollen; higher numbers mean faster cleaning for a given room size.
Best Types by Room and Need
For bedrooms, choose a quiet model with a low sleep noise level and a timer. For living areas, higher CADR units handle larger spaces. Units with pre-filters extend main filter life. Portable purifiers work best in single rooms, while HVAC-mounted filters treat the whole house.
How to Size and Maintain
Match the purifier’s recommended room size to your space. Replace filters on schedule, usually every 6 to 12 months, to maintain performance. Keep doors and windows closed while running the unit. For more guidance, visit the EPA guide on indoor air quality.
