We don't have that problem but it's probably because of our fix for the AC. We removed every other slat from most of our vents and also cut back the part of the vent mount that protrudes up into the ductwork to increase air flow. As a result most of the heat pumps volume drops into the living area.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.