R134a

R134a is a single-component HFC refrigerant.  Until recently, it has been the refrigerant of choice for automotive air conditioning applications (see also R-1234yf).  It is typically a medium temperature refrigerant used in large chiller applications and some commercial refrigeration applications, as well as transport refrigeration.  R-134a is also used as a component in other HFC blends.

R513A is a low GWP alternative to R134a.