Inverter air conditioner split air conditioner series klarstein windwaker energy efficiency class cooling a energy efficiency class heating a max cooling power 3 500 watt maximum cooling capacity btuh 11 942 btu seasonal energy efficiency ratio seer 61 hourly energy consumption in cooling mode 04 kwh60min max heat output 4 000 w energy efficiency heating 4 hourly energy consumption in heating mode 11 kwh60min indoor sound power level 54 outdoor