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 S12AK.UL2, Air conditioner outdoor unit, White, Cooling, Heating, 3500 W, 890 W, 4040 W LG S12AK.UL2. Type: Air conditioner outdoor unit, Product colour: White, Air conditioner functions: Cooling, Heating. Energy efficiency class (heating) (Average heating season): A+, Annual energy consumption (cooling): 201 kWh, Annual energy consumption (heating) (Average heating season): 1400 kWh. Outdoor unit noise level: 65 dB, Cooling airflow (outdoor unit): 1980 m³/h, Heating airflow (outdoor unit): 1980 m³/h. Energy efficiency class (cooling): A++