What compound is used as a refrigerant?

One commonly used refrigerant is hydrofluorocarbon (HFC) R-134a, which is widely utilized in automotive air conditioning and refrigeration systems. Another popular option is R-410A, a blend of HFCs, known for its efficiency in residential and commercial air conditioning. Both compounds are favored for their thermodynamic properties, though environmental concerns have led to the development of more sustainable alternatives.