13.5 to 15?
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...
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I have found that if I run my 15K AC thru the ducts the trailer gets hot. If I bypass the venta and direct the cold air straight down the trailer cools much better. Of course I also run my ceiling fan which helps stir the air. But you have to remember, low to none insulation, small BTUs, lack of air flow all contribute to the actual problem. More, way more BTUs may be your only solution.
