Test of system finds unit low on freon. Added 1.5 lbs of R22 freon to get customer cooling. Very low quality install job done by previous contractor. Lots of air leaks with system not transitioned very tightly or correctly. New return duct transition needs installed , new supply transition needs installed plus components sealed with mastic duct sealant. Strongly recommend new rubber coated overflow pan and overflow switch to be installed. If system leaks, it doesn't appear current condition or installation of existing overflow pan would catch the water.