Lots of posts out there on the flexible ventilation pipes not being correctly sealed to the vents and wasting heat/cool into the ceiling or wall space. Also, try to get into areas the vent pipe runs and see if there are kinks or other bad spots that restrict air flow.
If you can't see into the pipe try taking your phone and take pictures to see as far back the line to look for bad spots.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
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