Window AC consumes more power than split AC..The reason many be due to technology and as now-a-days most of the AC come with less power consumption technology ...cannt say that exactly...
According to my knowledge window A/C consumes more Power than split.
The reason why window A/C consume more power is because in window there will be one way circulation of air so that the compressor will be on for a long time for cooling the whole room.
where coming to split it has 4way circulation of air and it will not take much time the room will be chilled in a very short period.
Split AC consume more power that Window AC. Because spilt Ac has Two devices which are running on the electricity. Like. Indoor Unit and outside Unit. But todays world most of the AC consumes less electricity.