The Norcold is not a residential refrigerator so don't get confused by posts you might read in other forums about their usage. A RR runs on A/C only and would be the same kind of fridge you have in a house (Samsung, GE, etc.).
You have an RV fridge and it is designed to operate on either propane or A/C depending upon your situation or needs. The propane option allows the fridge to stay cold even while traveling (no A/C) but it also allows for your particular situation where you would like to reduce the A/C load. You can run your fridge on propane for an entire season on a 20-30# bottle. If you have a large built-in propane tank you could likely run it for a year if you did nothing else.
