I think jerboy has hit the nub of it. A swamp cooler doesn't play well with compressor type a/c, particularly in an RV where the interior needs to stay enclosed if the a/c is to lower the temperature.
Swamp coolers also work only in very dry climates (see Duoglides rely). If you aren't in one, don't even consider it.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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