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Step 1
Figure out the square footage of your home. Air purifiers are classified by the amount of air they can filter, and not all are capable of effectively reducing air pollutants for large spaces. Experts say that you need 100 CFM for every 250 square feet in your home. Knowing your home's dimensions will help you select the right model. Some experts recommend that you choose a model that is suited for larger areas than you need so that you get better cleaning at a lower level to reduce energy consumption.
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Step 2
Set your spending limit. Air purifiers can be a small expense or a rather large investment, so you need to be able to narrow down your options based on price. Remember that if you buy an air purifier that requires filters, you will need to change those periodically. Find out the prices of these filters and add that into your cost figure.
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Step 3
Check out some consumer reports and reviews about air purifiers. There are a couple links in the resources section of this article that take you directly to websites that review air purifiers and their filters. Different purifiers work better in some homes than others do. Remember that if you are a smoker or have pets your home will have more contaminants than others.
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Step 4
Check the purifier's efficiency rating. It is called clean-air delivery rate and it is abbreviated as (CADR). A CADR above 350 is considered excellent while a rating below 100 is considered poor.
