Inspection and replacement of main parts is easy due to innovative construction and an LED operational display. Quiet mode on the outdoor unit reduces the compressor speed to keep the unit quiet at night. Indoor units can be as quiet as 19 dB. Indoor wall-mounted units feature an ion deodorization filter, which deodorizes by decomposing absorbed odors using the oxidizing and reducing effects of ions generated by the ultra-fine-particle ceramic filter. An apple-catechin filter absorbs fine dust, invisible mold spores, and harmful microorganisms onto the filter by static electricity, and further growth is inhibited and deactivated by the polyphenol extracted from apples.