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++ A++ means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. A++ TCL MT1821, Air conditioner outdoor unit, White, Cooling, Heating, Dual split, 18000 BTU/h, R32 TCL MT1821. Type: Air conditioner outdoor unit, Product colour: White, Air conditioner functions: Cooling, Heating. Energy efficiency class (cooling): A++, Energy efficiency class (heating) (Average heating season): A+, Annual energy consumption (cooling): 293 kWh. Indoor unit type: Not included. Outdoor unit sound power level: 65 dB, Outdoor unit width: 85.3 cm, Outdoor unit depth: 34.9 cm. Warranty period: 5 year(s)