I was always able to ID a condensing unit either by its label, or from the homeowner's paperwork. I have a unit that is at least 15 to 20 years old (condenser) and all identifying marks are gone. The compressor doesn't have anything on it either. The evaporator has been replaced with a new, 2 Ton TRANE unit.
I am just curious if there are any ideas out there about how I could find out this condenser's name brand or manufacturer. Simply curious.