Not an HVAC professional, but handle facilities issues for a 2-story 8K sf brick building with black shingle roof. One section is on top floor and gets southern and western exposure. Today is in upper 90's and the Trane XE 78 unit supplying that section is putting out 76 degree air at a ceiling discharge vent. Room temperature at wall thermostat is 78 degrees. Stat is set on 75, but unit has not reached it in the heat of the day according to occupants. Inside humidity is about 60%, not sure about outside, but in this heat in NC, the heat index is probably in the low 100's. Unit was serviced about 3 weeks ago on a six month PM and the condenser coil cleaned and filter was changed. Getting occupant complaint that they are warm, but I think the A/C is doing all it can do. Should I expect more? Is it time to call the HVAC tech back in to look for other problems?