Noticed the same thing with our 2021 FR3 33DS. At the low fan speed, it's not terribly loud, but still annoying when trying to enjoy some TV.
Recently, we've kept the front AC off but kept the ducted bedroom AC on at high speed while also keeping the pocket door closed. Much quieter overall and the main area is still adequately cooled. It also allows us to cycle between both ACs rather than using the front one 90% of the time.
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2021 Forest River FR3 33DS
2019 Jeep Cherokee Trailhawk
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