The tons of air conditioning needed to cool a space are not relevant to square footage. There are many variables that can raise or even lower the tons of A/C you need to cool your home or business. Impact window replacement, for example, could lower the capacity by a ton or more, based upon the efficiency of the glass. Many studies have been done in Florida regarding this question, over and over. The findings are that most homes have A/C units that are too big.
We recommend that a thorough survey be done PRIOR to purchasing a new AC system, to ensure the new system is the proper tonnage. Call GMC for assistance: (954) 973-5980.