How to Choose an Air Purifier for Your Home
Affiliate disclosure: this guide contains affiliate links. If you buy through them, Smart Choice may earn a commission at no extra cost to you. Our checklist is based on the product information and refund terms we review. Read our full disclosure.
An air purifier only helps if it is sized for your room, uses a filter that does what the box says, and costs an amount you can keep paying. Use the checklist below before you choose.
1. Match the unit to the room size
Look for the Clean Air Delivery Rate (CADR) in the manufacturer’s specification, not only in the marketing text. A common rule of thumb is a CADR of about two-thirds of the room’s area in square feet. For a 200 square foot bedroom, that points to a CADR near 135.
2. Check the filter type
- A true HEPA filter removes most fine particles, including many dust and pollen particles.
- “HEPA-type” or “HEPA-like” is not the same thing. Ask which standard the filter meets.
- Activated carbon helps with odors, but it does not replace a particle filter.
- Avoid units that advertise ozone generation. Many health agencies advise against intentional indoor ozone.
3. Count the running costs
Replacement filters are where most of the cost is. Check the filter price, how often the maker recommends changing it, and the yearly total. Then check the power rating if the unit will run all day.
4. Test the noise and placement
Look up the noise level on the lowest and highest settings. A bedroom unit should be quiet enough to sleep beside. Keep it clear of walls and curtains, and close windows while it runs.
Who should not rely on a purifier alone
An air purifier does not replace ventilation, and it does not fix mould or humidity problems. If you have asthma, allergies, or breathing symptoms, speak with a doctor about your triggers first.
Next step
When a unit passes this checklist, read the full product page yourself, including the refund window and the seller’s terms, before you buy.