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 D18RN.UL2, Air conditioner outdoor unit, White, Cooling, Dehumidifying, Heating, R410A, 2.76 lbs (1.25 kg), Twin Rotary LG D18RN.UL2. Type: Air conditioner outdoor unit, Product color: White, Air conditioner functions: Cooling, Dehumidifying, Heating. Energy efficiency class (heating) (Average heating season): A+, AC input voltage: 220-240 V, AC input frequency: 50 Hz. Outdoor unit sound power level: 65 dB, Outdoor unit noise level: 55 dB, Cooling airflow (outdoor unit): 2100 m³/h. Energy efficiency class (cooling): A++