2002 Keystone Cougar 278EFS (5th wheel) - about 28' long. I serviced the A/C this spring before it got hot. It has now got HOT. I have a 13.5K BTU original Dometic ducted with thermostat. If I cam...
If the 13.5 is working properly, don't expect much difference.
Can you close off the vents to the bedroom? We used to do that and that helped a lot because it only had to cool 2/3 of the trailer. By night, it was able to catch up and the vents in the bedroom were reopened.
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