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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.
AC (Air-conditions and Refrigeration are always rated in Tons. Air conditioners are always rated in Tons capacityinstead of kW because Air conditioners are designed on the basis of quantity of heat removal from room, hall or specific area.