Air purifiers

What actually determines whether an air purifier makes a noticeable difference, why room size versus coverage rating decides more than the brand, and what filter costs owners wish they had planned for.

• Are air purifiers worth it? Yes, if you have allergies, asthma, or smoke.
• How much difference does an air purifier make in a home? A real difference, but not a cure-all.
• What do air purifier owners wish they'd known before buying? Filter costs are the real price.
• Do air purifiers help with dust? Yes, but they catch dust in the air, not on surfaces.
• What does an air purifier do? It cleans the air you breathe.

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