Alex and Tee wrote:
Front measures 42.3 rear measures 44.1 at the roof vent. It is ducted from front to rear. Same fan speed on both. Seems to be equal air flow from all vents. 3 vents in the roof in front, 3 in the rear.
30 degrees delta (Difference) Between inlet and outlet sounds like they are working as designed.
The problem is common especially if you have a dark color scheme (Like mine did) it just soaks up the sun faster than the A/C's can dispose of it.. I upgraded from 13,500 to 15,000 BTU both ends and it still got hot.