Mine is only "very loud" when the main area AC cold air dumps are open and on high fan. After the "quick cool" is over and we want to watch some TV, I close the dumps and let the AC blow through the ceiling vents on low fan.
Lou, Laura, & Freya the wonder dog
2008 GMC Sierra 3000HD Crewcab SB Allison Duramax
2019 Flagstaff 8529FLS - Pullrite 3300
HAM CALLSIGN - KC3FFW