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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 Registers per Room. Under basic guidelines, HVAC experts recommend at least one AC register or duct per room. But number this isn't set in stone, as some owners may prefer more than one register for better airflow.