I am using O General window AC 1.5 ton from last 10 years and it has been a beast for me .
It has a very good cooling system , within minutes my room gets cool very easily.
Regular yearly service is all this AC needs , thats it which cost very low.
Well it is a 10 year old ac so naturally it does little bit of sound but it does not matters a lot.
Yes I will suggest this brand because many technicians say that this is best ac.
A total value for money .
Just go and buy it