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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 1 1/2-ton air conditioner in the southern United States is 600 to 900 square feet. That same air conditioner in the northern part of the United States is 700 to 1,100 square feet. Air conditioning units increase in size by half-ton capacities. In general, the steadier the climate, the smaller the air conditioner needed. The square footage range for each half-ton varies about 300 square feet, so a 2-ton air conditioner in the southern United States is 901 to 1,200 square feet.