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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.
Here are a few: 1  Well, you've got a 3 ton AC in here now, so we're just going to put in a new 3 ton unit. 2  Well, you've got a 3 ton AC in here now, so we're going to add another ton to that and give you a 4 ton system. 3  You told me your house was 2400 square feet, so that means you need a 4 ton air conditioner.The first answer is bad because they're assuming the original contractor sized the system properlyâand that nothing has changed since. Well, you've got a 3 ton AC in here now, so we're just going to put in a new 3 ton unit. 2  Well, you've got a 3 ton AC in here now, so we're going to add another ton to that and give you a 4 ton system.