It is an important development as the industry more and more embraces HFC refrigerants in light of the phaseout of HCFCs. HFC refrigerant systems use polyolester oils which are said to have a greater ability to retain moisture than HCFC refrigerants that ran with mineral oils.
Someone with first-hand knowledge of the challenge is Aaron York of York Quality Air of Indianapolis. “Too many of us are only concerned about moisture when it freezes out in our metering devices and blocks, or at least impedes, the flow of refrigerant.