The Quietest Air Conditioner on the market. Energy Star. 2 year In Home Warranty on full parts and labor on all LG air conditioners. The No-Aging Plasma Heat Exchanger is a great feature. LG has developed the new heat exchanger that there is no-aging on the surface of fin. It is the first in the world. 2 year In Home Warranty on full parts and labor on all LG air conditioners. This model also has the Permanent Air Filter. The Plasma Air Purifying System developed uniquely by LG not only removes microscopic contaminants and dust, but also removes house mites, pollen, and pet fur to help prevent allergic diseases like asthma. With a filter that can be used over and over again by simply washing with water, you can enjoy clean fresh air without having to worry about changing the filter every two years as in the past and save cost.