What are the commonly used refrigerant models?

First, for automotive air conditioners, in the past, R12 (methyl chlorofluoride) was mainly used, which is a chlorine-containing refrigerant. It has now been converted to R134A (tetrafluoroethane), which has characteristics such as no destruction of the ozone layer, non-flammable, non-explosive, and non-toxic. In the future, R1234yf and CO2 will be more environmentally friendly refrigerants and will be favored. Additionally, for household air conditioners, they have transitioned from R22 (chlorine-containing) in the past to the current R410A, which also has characteristics such as no destruction of the ozone layer, non-flammable, non-explosive, and non-toxic. R32 (difluoromethane) will become a trend.