Guide library

Air cleaners · buying guide

Choose the right air cleaner for one room.

Size one enclosed room or browse by cleaning power. Then compare eight researched models on noise, filter ownership, features, and meaningful limits.

A person adjusting a room air cleaner in a living room

Room size

Find the cleaning power you need.

For one enclosed room with an approximately 8-foot ceiling. Choose wildfire smoke or everyday cleaning.

When this tool is not enough

Choose more capacity for a higher ceiling, an open area you have not fully measured, heavy smoke entry, or a quieter fan speed. Do not use this result as a whole-home rating.

Enter both dimensions to see your minimum. Or browse without measuring.

How the minimum is calculated

For wildfire smoke, AHAM recommends smoke CADR at least equal to the room area in square feet. For everyday particle cleaning, its general rule is at least two-thirds of that area. We round up to a whole cfm. Both assume an approximately 8-foot ceiling; higher ceilings and lower fan speeds need more capacity.

Read AHAM’s sizing guidance

SHOPPING CHECKLIST

Before you buy

Check the practical details for the model you are considering.

1

Check noise at a useful speed

Cleaning ratings are usually measured on high. Make sure you can tolerate the setting you will need.

2

Check the exact replacement filter

Confirm its model number, current cost, availability, and replacement schedule.

3

Avoid ozone generators

Choose a filter-based unit that does not intentionally generate ozone. Check the current CARB list.

PRODUCT CLAIMS

Check a claim only when you see it

“Covers a large room”

Find the air-change rate behind the number. One air change per hour is not the same as repeated cleaning during smoke.

“True HEPA”

Useful for particles, but not proof that the unit moves enough air for your room.

“Removes smoke”

Smoke CADR measures particle cleaning. It does not prove removal of every wildfire gas or odor.

Built-in air sensor

Useful for trends near the machine. It is not a whole-home measurement.

Auto or smart mode

Convenient, but it does not replace enough airflow. Continuous operation at a useful speed matters.

Evidence and source directories
EPAIndoor Air FiltrationEPAGuide to Air Cleaners in the HomeEPADIY Air CleanersCARBCertified Air Cleaning DevicesAHAM VerifideRoom Air Cleaner Directory