Voltas ACs were considered to be the best a little while ago. Now they have their 183SY 1.5 Ton Split Air Conditioner.
First and foremost, this Air Conditioner has only 3 star rating. So invest your money wisely. A big feature is 3D air flow which all window Air conditioners lack. It has a huge 1500 or something watt consumption so your electricity bill is going to pop up like a rocket.
One more catchy thing: This air conditioner comes with an app on android and iOS to calculate the optimum cooling settings for your conditions, which is really a breakthrough in air conditioner lines. This AC cools the room just fine and you can really use the app, it is of a great use.
So all in all this AC gets 3.5 stars out of 5. This costs around 31000 Rs.