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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 one-ton central unit uses about 1,900 watts of electricity per hour, while a mega-sized five-ton model uses about 9,200 watts. Depending on how many window units it takes to keep your house cool, a central air conditioning system actually may be less expensive to operate than multiple window air conditioners.