I just recently picked up a 2014 Bullet Premiere 31BHPR - having some of these similar air issues. I followed the steps above as far as sealing ducts etc. airflow is 10x better, will see how it does overall cooling in the camper. I called Keystone and my unit isn’t braced/wired/ducted for a 2nd a/c so fingers crossed!
My buddy has. 2018 Hideout 272LH with smaller a/c and it freezes you out!
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