> Probably one of the most reliable devices you will have in your house is the refrigerator, as its compressor has the minimum of moving parts and carries its own lubrication.<p>Most compressors (if not all) self lubricate since they compress in a closed loop. I've recently become a home owner and had to replace the compressor in my A/C unit (as well as some other parts) and it is truly a marvel of engineering.