I am using this blue star AC(3 star) since last summer and its amazing, it cools my room in 2 minutes which is at the top floor.
It was selected by my father because he has the same model in his office and he was very impressed with the cooling and quality. So I bought this model with his suggestion and today I am really satisfied with its quality and performance.
It consumes less electricity and makes no noise.
Its perfect for medium size room or hall.
Perfect to buy and value for money.