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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.
Most homes, depending on ceiling heights, windows, and airflow will need a ton of air conditioning for every 400 to 1,000 square feet. Higher air conditioning tonnage can mean higher energy costs because the more tonnage an air conditioner is rated for the more work it is doing.