Air Purifier Buying Guide: Everything You Need to Know

Guides

Buying an air purifier is confusing because manufacturers use inconsistent terminology and make exaggerated claims. This guide cuts through the marketing to help you make an informed decision.

START WITH ROOM SIZE. Every air purifier has a recommended square footage. Look for the CADR (Clean Air Delivery Rate) rating. A CADR of 300 means the unit cleans 300 sq feet every 12 minutes. For bedroom use, consider your actual room size. Many people buy units that are too small for their space, then wonder why results disappoint.

FILTER TYPE MATTERS. True HEPA filters are non-negotiable if anyone in your household has allergies, asthma, or respiratory concerns. Don't accept HEPA-style or HEPA-type filters—these don't meet the strict 99.97% capture standard.

CONSIDER NOISE LEVELS. Air purifiers run 24/7 for maximum benefit. You need to tolerate the noise. Check decibel ratings on lowest settings. Anything 25dB or below is whisper-quiet. Above 35dB becomes noticeable.

FILTER REPLACEMENT COSTS add up. Some filters cost $20 annually, others $100+. Calculate long-term ownership costs, not just the purchase price.

SMART FEATURES are nice but not essential. WiFi control, app monitoring, and auto mode are convenient but add expense. Decide if you'll actually use these features.

PRE-FILTERS extend HEPA filter lifespan. Units with pre-filters (which capture larger particles) will need less frequent HEPA replacement, saving you money.

ACTIVATED CARBON filters handle odors, smoke, and VOCs. If odor elimination matters in your situation, ensure your unit includes carbon filtration.

OUR RECOMMENDATION: Start with True HEPA as mandatory. Match CADR to your room size. Check noise levels. Consider long-term filter costs. Then choose based on price point and additional features.

Don't overthink this. Any True HEPA air purifier will provide measurable air quality improvement. Pick one that fits your budget and room size, then run it consistently for best results.

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