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You can either go for a 1 ton AC or a 1.5 ton AC depending upon the amount of light that enters the room, area and direction of windows, the floor on which your room is situated, number of people occupying the room and the number of lights.
You may need about 130 (or more) watts if your room is larger than 4,500 cu ft, and you listen from about 15 feet (or more) away from the Klipschorns. That's my situation.