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Depends on how old the evap is? If it has any age at all you will need to replace the evap to match the new condensing unit, a little thing about SEER ratings and such. Some old evaps were dual rated, but if you install a new 13 Seer unit you will need to match the evap to the cond. to get the proper Seer rating and capacity that the new condensor is rated.
You can go to the ARI website and see how the units match up and what the Seer level and capacity are.
Don in Mo