Figure 6 shows the compressor discharge temperature comparison between R410A and R32. The discharge temperature of R32 was significantly higher than that of R410A. The difference was quite remarkable at the ambient temperature of -18ºC, at which an increase of 34.2ºC was observed. This also brings up one challenge regarding the compressor design when switching from R410A to R32. Figure 7 shows the refrigerant mass flow rate comparison between R410A and R32. The refrigerant mass flow rate decrease was found to be between 28.6% and 31.2%, and the maximum decrease was also observed at the ambient temperature of -18ºC.