Fridge.com Identification Number (FIN) is one permanent ID per refrigerator and freezer model across 25+ retailers: ...
"I've never seen it in any of the manuals." ...
Another energy guzzler is your clothes dryer. One way to cut down on drying costs is to choose an efficient washing machine.
Check refrigerator controls, shelf placement, and airflow to find out why chilled groceries are developing icy patches.