= 8440446.82 joules 8000 btu air conditioner 8000 btu portable air conditioner 8000 btu air conditioner room size 8000 btu to watts 8000 btu square footage 8000 btu mini split 8000 btu ac room size 8000 btu room size 8000 btu ac wattage 8000 btu radiator