I park mine at my house and on shore power, so I keep it running all summer. The electric part uses heating coils and they can rust if not used. We had one a couple decades ago that was rarely used on electric and eventually they rusted out. It doesn't hurt to have it running, it is designed to run, not sit. It is a sealed unit, and the process is simple. It also works great for keeping beer cold all summer long. My new one is 12v, so when power goes out, once the battery is low, no cooling, so can't really use it as a backup.
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