I typically test the Delta T of the A/C at the return and just past the plenum. Today, I got a difference of 29°F which is way higher than anything I've gotten before.
The unit is 3 years old, outside temp was 75°F, overcast, RH about 40-50%. I let it run for about 20 minutes after running the heat for about 15 before I measured the temp. The temp past the A-coil was 41°F. I'm sure there are many factors to this and I don't look at Delta T as the end-all of indicators, but I figured it's worth discussing.
Is this high of a Delta T a concern? It seems odd to ask this question, but it's just so out of the ordinary.