Which type of refrigerant is most commonly used in Thermo King units?

The most commonly used refrigerant in Thermo King units is R-404A. This refrigerant is favored in many commercial refrigeration applications due to its thermodynamic efficiency and its ability to operate effectively across a wide range of temperatures. R-404A is a hydrofluorocarbon (HFC) and does not deplete the ozone layer, making it more environmentally friendly compared to some older refrigerants. It is specifically designed to replace R-22 and R-502 in low and medium temperature refrigeration systems.

R-134A, while commonly used in automotive air conditioning systems, does not have the optimal performance characteristics for the refrigeration requirements of transport units. R-410A is primarily used in air conditioning and heat pump systems but is not suitable for transport refrigeration applications. R-22 has been phased out in many applications due to its ozone-depleting potential and is no longer being used in new systems, making R-404A the preferred refrigerant for the refrigeration needs of Thermo King units today.