Fig. 14 shows the performance comparison between R32 and R410A with vapor injection. As seen from Fig. 14a, the capacity improvement comparing R32 to R410A was observed to be 2e7%, and COP improvement was observed to be 1e6%. However, there was no improvement at the extreme heating condition of "18 #C and extreme cooling condition of 46 #C. At the extreme heating condition, the capacity and COP degradation were observed to be 11% and 11%, respectively. At the extreme cooling condition, the capacity and COP degradation were observed to be 3% and 4%, respectively. The power consumption increase was observed to be 2e3%. Fig. 14b shows the total refrigerant mass flow rate comparison. It can be seen that the refrigerant mass flow reduction at the extreme conditions was quite significant. "41% was observed at the extreme heating condition, and "37% was observed at the extreme cooling conditions. As seen from Fig. 14c, the compressor discharge temperature using R32 was significantly higher than that of R410A. A maximum discharge temperature increase of 39 #C was noticed at the extreme heating condition of "18 #C.