A++ means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Directive 2010/30/EU. A++ LG S3NW09JA3AA, Air conditioner indoor unit, White, Cooling, Dehumidifying, Heating, 890 W, 3700 W, 890 W LG S3NW09JA3AA. Type: Air conditioner indoor unit, Product colour: White, Air conditioner functions: Cooling, Dehumidifying, Heating. Energy efficiency class (heating) (Average heating season): A+, Annual energy consumption (cooling): 125 kWh, Annual energy consumption (heating) (Average heating season): 875 kWh. Indoor unit type: Wall-mountable, Indoor unit noise level (high speed): 59 dB, Indoor unit width: 83.7 cm. Energy efficiency class (cooling) (old): A++