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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.
One ton of cooling = 12000 BTUS and is designed to cool approximately 400 square feet of living space. So, if you have a 2000 square foot home you might have one 5 ton unit or two units a 2 and a 3 ton.