The gas-absorption refrigerators used in RVs are much less efficient at cooling than your home fridge so their recovery time is slower. In addition, the ability to absorb heat energy introduced when the door is opened is very dependent on the contents. If the fridge is fairly full a considerable amount of heat can be absorbed there by keeping the temp fairly stable. If the fridge is mostly empty, there is little ability to absorb heat. If you are having difficulty keeping the temp stable, try keeping fridge full and open time to a min. A fan in the outside compartment to assist on removing heat from the coils is also a big help.
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