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Air conditioning in high humid enviroments is very difficult. High humidity means in essence higher BTU loads. Due to the compact nature of the AC units, the manufacturers design high temperature differences between the refrigerant gas and the ambient air, resulting in frost build up on the evaporators. If you build up frost, then you lower the AC efficiency to the point that it will do very little cooling because of low air flow, generally this frost in RV AC is dealt with by a "freezestat" mounted on the heat exchanger which senses "frost" and cycle the compressor off to thaw or clear the evaporator. Restrictive air filter material, dirty air filter, or restrictive duct work all compound the problem. These factors can contribute to premature compressor failure.
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