A:
I'm not sure what you're referring to regarding a "new refrigerant". Perhaps you are asking about the special insulation that Samsung uses in particular models, allowing for more capacity compared to other models with the same dimensions? If so, the special insulation can be found in the RFG237, RSG257, RFG297 and RFG293, but not the RF217ACPN which uses our standard insulation.
I hope this answers your question,
Ms. Samsung