Refrigerant Usage

[MadMax]

In Australia, we mostly use R22, R407c and now R410a as refrigerants for split ducted, rooftop & water source package equipment.

What other refrigerants are in use elsewhere? Or in Australia? Is there any alternative? I have heard of some gas where you dont require a licence?? Sounds dodgy, but apparently in common use in Europe now??

[PVA]

In Ukraine we mostly use R717 (ammonia) for industrial refrigeration system, seldom we use R744 (CO2), this refrigerant is becoming more and more usable. But also ammonia is the best for industrial refrigeration.