Spoke with Bob on arrival who indicated unit was not keeping up consistently on hot days and temperature would climb during the day until is was up in the 80s. Walked the home, the unit installed is for the 2nd floor only. Reviewed installation and inspected ductwork for leakage. Old ducts are not sealed, it is recommended to seal ductwork but this is not related to problem. Inspected wiring and found unit wired as 2 stage and outdoor unit is a single stage unit. Rewired to jump Y1 and Y2 together as recommended in installation manual. Checked dipswitches to ensure airflow is setup properly, set to 390 cfm/ton and set to 2 ton. There was no signs of condensation in pan or around drain line but trap is not insulated. Turned system on and checked system charge and delta across coil. Superheat at 18 degf and subcooling at 8 degf and delta T at 18 degf. System is working properly at this time. It was 75 degf outside so there were no signs of a problem. Instructed Bob to call me