It comes with the exhaust hose, but you need to purchase a window sealing kit separately

The cooling capacity depends on the size of the room and also on how well it succeeds in compensating for the inflow of hot outside air through the cooling. The unit has a medium energy efficiency, it has an A rating and consumes 1 KW of electricity per hour. If higher cooling capacity is important, a unit with 12000 BTU should be looked at. The power consumption may be slightly higher, but so is the cooling capacity.