Can the A/C temperature coming out a vent be significantly lower than the temperature in the air handler above the evaporator coil? If so, how does the air get colder as it comes out the vent? Or how does the vent get cooled below the temperature of the air cooling it?
(Background: I've had two A/C contractors out to my house. One was a friend my family trusts, who said there were significant problems with the system. One was an inspector from a company with no reviews who was paid by my home warranty company. He said everything was normal, which I'm somewhat doubtful about. He also measured the vent temperature as in the low 40's while the air handler temperature was 55, which made no sense to me whatsoever.)
Let me know if I should move this to physics SE.