Remember the whole point of this post was "Try this before you buy a 2nd AC unit or bring your unit in for AC service". My AC was Terrible before but now Im very happy with it.
I already had my RV an appt (a few weeks out) at CW when the guy behind the parts desk said "Did you try moving the probe" so I asked him a few question. That led me to do research on this subject and I found that many folks had air leaks in the box. Then I thought Why not insulate the top part after I felt the heat with my hand on the black AC cover on the roof.
Afterward I saw the results of my mods I cancelled my CW appt.
These mods may work for you - may not - but for the little time they take and very little money for the insulation I felt they were worth the shot.
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