Two more thoughts on this. If you're at a high altitude the air flow will be affected due to the density of the air. This could cause slightly lower flow and higher temperature. But I doubt it's significant in this case. Also if you have a heated underbelly the ducting giving to those areas might be affecting the air flow if they are crushed or blocked.
My trailer is sitting out in the snow all winterized just waiting for spring. But I'll fire up the furnace tomorrow and see what I find as now I'm curious to see how my heat will work!
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2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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