The best type of AC to buy in India is an inverter AC, which not only saves electric power cost, but is more silent and comfortable with steady continuous cooling.
A normal AC first over cools the room and cuts off the compressor till the room again gets warm, then it will restart. This constant starting and stopping of normal AC compressor makes the room too cold for a short while and then it becomes too warm. This is does not lead to a comfortable sleep. Also with the AC compressor running at high speeds when it is on, and with the constant restart of the AC compressor, a normal AC consumes a lot of current making a normal AC very inefficient and costly to use.
An inverter AC on the other hand controls the temperature of the room by running the compressor at different speeds, at very slow speed when the room is at the right temperature and speeds up if the temperature starts going up. Thus a room cooled by an inverter AC stays at a constant comfortable temperature enabling a very good sleep. Compare inverter AC vs normal AC, an inverter AC uses 40% less electric power and you get a much better sleep with constant cool temperature. The inverter AC is very silent and lasts much longer than normal AC, because the inverter AC runs at slower speeds and there is no wear and tear of the compressor stopping and starting constantly.