It doesn't matter whether you are on shore power or propane. It matters how hot the counter top above the refrigerator gets. When I feel it getting overly warm on the counter top, I switch on the fan, then turn it off after it cools down. I don't have to do this very often, but I don't normally camp where the temperatures are particularly hot either.
2022 T@B 400 BD 2019 Ford F-150 3.5L Ecoboost with Long Bed
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2019 Ford F-150 3.5L Ecoboost with Long Bed