If you’re asking this question, it’s almost certainly because you have concerns about the quality of the air in your house. Maybe there’s an increase in illness, or the air feels dustier and dirtier than normal. Or you may have read some of the worrying statistics about air quality in homes—most of which are true.
Whatever the reason, you’re wondering if you should have an air purifier or an air filter installed. Air filters are non-powered systems that use fiber weaves to trap unwanted particles, while air purifiers are electrically-powered devices that use ionization, ultraviolet radiation, or other methods to remove pollutants.