[Bigrig]

All the heat when it comes on, goes upstairs to the master suite. It get stuffy while we wait for the main cabin to warm.
Had it looked at at the dealer, findings are as follows: Turned on furnace and let it heat up for 10 min. Tested and measured heat output at registers, M/S at 143*, Bath at 97*, Entry at 109*, TV at 103*, couch at 96*: After 20 mins, temps are 150, 103, 114, 112, 105. This is normal per factory.

Looking for ideas to reverse this order and get the furnace to blow more in the main cabin. We like a cool bedroom and we would not mind if I could re-route ducts without any safety concerns.