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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.
A 2 Ton A/C unit can normally handle around 1300 square feet and a 2 1/2 ton should handle about 1800 or so. to determine the correct size, a Heat/Cooling Analysis should be performed by a qualified individual form a HVAC company.