Good Housekeeping and Consumer Reports are two review sources that subject products, including air purifiers, to rigid trials. Although there are dozens of reliable sources for reviews, the extensive testing conducted by professionals with these two organizations make them popular sources for researching products.
Good Housekeeping conducts extensive testing on products at the Good Housekeeping Institute. On those products in which it bestows its famed Seal of Approval, it offers a limited guarantee. Consumer Reports, likewise, also conducts extensive testing of products in its labs. In contrast to Good Housekeeping, however, Consumer Reports conducts tests and rates products based on actual feedback from people who own the products in question.