Furnace dated 1977 A-coil dated 2010 A/C unit dated 2001. I noted two dryers installed on the liquid refrigerant line one at the A-coil and one at the outside unit which alerted me to the fact someone had no clue what they were doing.
I felt the supply air at the register with me old crusty hand and it did not feel cold as I would have expected with the outside ambient being only 85 degrees.
Normally I would have stopped operation at that point and just called the unit out as not cooling properly. Old stubborn me I go for my gauges just to make sure, I do not want some clueless contractor coming up with some off the wall statement