The EPA awards ENERGY STAR label to any efficient consumer product which also tests as energy-saving. An Energy Star label indicates an eco-friendly machine. EPA has tested various purifiers and laid the norm that if a conventional air-purifier runs continuously for one year, it consumes an average of 835 KwH (kilo-watt-hour). This works out to an air-purifier of 100 watt power. Taking 1KwH to cost roughly 12 cents, a conventional air-purifier would consume $100 worth of electric power. Half this value, or $50 power consumption/year, earns an Energy Star label. However, performance of air-purifiers is generally measured through CADR, which is an AHAM measuring standard. An air-purifier is rated excellent if the CADR is 350 or more. A poor air purifier has a rating of 100.
One popular Energy Efficient Air Purifier is Blueair ECO10, which works efficiently using around 95% less energy than its peers. The winning features of this Energy Star air-purifier are:
A patented HEPASilent filter technology with a superior EC fan motor that captures 0.1 micron-sized particles; two speeds, four efficient pre-filters and a re-usable main filter; low power consumption of merely 10W; exceptional performance, noiseless operation and unmatched lifetime warranty.