HFC-32 is being considered as an alternative for HCFC-22 in room air conditioners. HFC-32 is non ODS. Its GWP is 675. HFC-32 is classified under A2L under latest ASHRAE 34 standard. The volumetric capacity of HFC-32 is about 60% higher compared to HCFC-22. HFC-32 gives lower pressure drop in heat exchangers than both HCFC22. The pressure drop for HFC-32 in evaporator is 36% lower than HCFC-22. In condenser, pressure drop are much lower than pressure drop in evaporator. The discharge temperature of HFC-32 is higher than HCFC-22.In this paper, the simulated performance of split air conditioners (SAC) using HFC-32 with nominal cooling capacity of 5.1 kW was studied. The simulation has been carried out for SAC using test conditions prescribed in Indian Standards IS 1391 (1992) Part I. The simulation has been carried out for variation in compressor capacity, capillary, and exchanger tubing. The results showed that COP improvement for HFC-32 air conditioner is about 8% when 5 mm tube OD was used for condenser. There is marginal improvement in COP when capaillary optimization was performed.