How to keep bunk room warm

[Tlv0923]

Hello!
We have a 2020 passport 292BHWE and are having trouble keeping the bunk room warm at night. We took it in for some other service and asked them to look at the vent in the bunk room to make sure it wasn’t blocked as the air output is minimal compared to our other 2 vents, and they said it was fine.
Anyone have any ideas to keep it warmer in there? We have little kids that sleep in there and it’s been getting pretty cold at night where we are. Thanks!