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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.
As room is bigger 1.5 ton AC will be better. Power consumption will be the same. 1.5 ton AC will obtain the set temperature earlier and will shut off while 1 Tom AC will take a long time to coll.