Every year when we travel for over a month or go to FL for the winter we have turned the fridg off, no problem with seals?
But you got me concerned when you said your appliance guy said otherwise.
If you do a search for refrigerator vacation settings you will see
Do a search for refridgerator vacation setting.
GE recomends it
Refrigerator - Vacation Settings
As does Subzero, Frigidaire as others
Don't forget how long it was in the warehouse b4 you bought it.
If the air conditioning is turned off or set at a higher than usual temperature, the efficiency of the freezer decreases as the temperature in your home increases. The hotter your home becomes, the higher the number of hours your freezer will run.
It is not unusual for a manual-defrosting refrigerator to run twice as much as usual, due to the higher temperatures in your home. Self-defrosting refrigerators may run an additional 20 to 30 percent.
To prevent the build up of odours and mildew forming when you are away, clean the inside just before you leave with a 50/50 mix of water and vinegar, not forgetting to
scrub the door gaskets, shelves, sides and door.
