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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.
Generally, the sizes of air conditioners are between 1.5 and 5 tons. You can determine the right air conditioner size for your home by hiring an HVAC contractor to do a load calculation. The following air conditioner prices include AC and coil installation: 1  1.5 tons and 18,000 BTU â $1,475.2  2 tons and 24,000 BTU â $1,990.he higher the rating, the more energy efficient the unit is. Air conditioner prices can vary significantly depending on the efficiency ratings of the units. The prices listed below are for 2.5-ton AC units with coils installed: 1  13 to 14 SEER (standard efficiency) â $2,370. 2  15 to 16 SEER (high efficiency) â $3,140.