I have a refrigerator stored in my garage. It can only be on one wall. The receptacle is on an adjacent wall. Maybe 15 feet away. The fridge tag lists 4.5 amps 115V source and single phase. Garage/Den breaker switch is a 15 amp. The dedicated kitchen refrigerator/GFI breaker switch is 20 amp. My first thought is to use a 10 or 12 gauge extension cord. Would this be OK? My second thought is to run surface mounted EMT conduit and a metal receptacle box to the wall by the fridge. Any thoughts on these two options?
I'd use a surface raceway for this job
This sort of branch-circuit extension job sounds like something that'd be trivial to do using home-store-special 500-series Wiremold or equivalent surface metallic raceway, with a a few 14AWG THHNs run inside it and a single 15A receptacle at the far end for the garage fridge. You can either have a receptacle (even a GFCI) at the starting point, or simply turn it into a pure junction box instead using a blank cover plate.