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++ Samsung AR24MSWNAWK, Air conditioner indoor unit, White, Cooling, Fan, Heating, 6800 W, 1400 W, 7900 W Samsung AR24MSWNAWK. Type: Air conditioner indoor unit, Product color: White, Air conditioner functions: Cooling, Fan, Heating. Energy efficiency class (heating) (Average heating season): A, Energy efficiency class (heating) (Warmer heating season): A++, Hourly energy consumption (cooling): 6.8 kWh. Indoor unit sound power level: 62 dB, Indoor unit type: Wall-mountable, Indoor unit noise level (low speed): 26 dB. Outdoor unit noise level: 54 dB, Outdoor unit width: 34.6" (88 cm), Outdoor unit depth: 12.2" (31 cm). Energy efficiency class (cooling): A++