We have a 2020 29M with the identical situation as the OP. I have already tried blocking one of the bedroom vents but it made the furnace trip due to high internal temperature level. I have already purchased a swivel vent to try but I like the OP's idea of re-routing one of the bedroom vents out through the cold air return vent. I may try that.
I will update here what I do and be watching this thread with interest for more ideas.
-Ken
__________________
I like to travel, but I also like to get back home.
|