R32 refrigerant has a much lower global warming potential (GWP) of 675 compared to the widely-used R410A, which has a GWP of 2088. From 2025, the European F-Gas regulations will ban refrigerants in splt air conditioning systems with a GWP over 750.
In addition to the lower GWP, using R32 means that air conditioning systems will need 30% less refrigerant charge than R410A. With less refrigerant charge, heat exchangers and other parts can be made smaller, which makes air conditioning systems smaller too.
Tools and equipment to work with R32 are increasingly available, but there have been few R32 systems on the market.