We recently raised the temp by 3F on the each of the underseat units after about two years for the following reasons:
1. The ice cream was coming too hard from the freezer.
2. No food ever spoiled either in the freezer nor in the refrigerator in the past two years.
3. The beer was coming too cold from the refrigerator.
4. Some of the vegetables in the freezer would sometimes come out partially frozen. The Admiral complained.
We'll see how things evolve.
At anchor, Mar Menor (Murcia)