Our 2017 38ft Challenger has the exact same two Coleman 13,500k BTU units that our 2002 38ft Southwind had, but the inside temps between the two motorhomes in the exact same weather conditions is night and day. The Southwind would hold 72 degrees and lower all day long with no trouble. The Challenger struggles to hold at 78-79 degrees when the outside temps are 89 degrees, as they are today, as I sit here in my RV. I don't think the A/C units are the problem.
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