The new refrigerant for 2025 is a hydrofluoroolefin (HFO) called R-1234yf. It has a global warming potential (GWP) of 4, which is significantly lower than the GWP of the current refrigerant, R-134a, which has a GWP of 1430.
R-1234yf is also non-flammable, unlike R-134a, which is flammable. This makes R-1234yf a safer choice for use in air conditioning and refrigeration systems.