Other brands may suggest replacing the filters every six months; that can really add up! Both the SHARP long-life True HEPA filter and the long-life Activated Carbon filter last up-to 2 years, depending on the environment. The FXJ80UW meets the strict energy efficiency criteria to earn the ENERGY STAR® Rating. According to energystar.gov, Energy Star Rated products use less energy, save you money on your electricity bill, and help protect the environment by causing fewer harmful emissions from power plants. Read more about it with the Sharp FXJ80UW Air Purifier here.