Hers is a little food for thought. 2 1/2 ton ac puts out the same air flow (cfm) as 3 ton but has 6,000 less btu.
Could you explain this statement, on a split its the air handler/furnace blower, ideal air flow is 350-400 cfm per ton depending on duct size, therefore a 2 1/2 ton would be 875-1000 cfm and a 3 ton 1050-1200 cfm