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A household refrigerator was machine that operates continuously throughout the day to kept food fresh. So that a little savings in electricity consumption was very beneficial. The purpose of this study was to obtain savings in refrigerator electricity consumption by replacing R-134a working fluid with Musicool-22 natural refrigerant. Furthermore, to reducing global warming potential of the earths surface due to HFCs refrigerants. The study was designed experimentally with the retrofit refrigerant drop in substitute method on refrigerator practicum tools. The test begins by measuring the performance of refrigerators using R-134a working fluid. Then the working fluid R-134a is retrofitted with MC-22 with a mass of 15%, 20%, 25%, 35%, and 45% of the mass of R-134a. Finally, the performance of the refrigerator that has been retrofitted using the MC-22 was measured as a measurement of the performance of refrigerator using the R-134a. The test results show that, when the refrigerator is retrofitted using MC-22 with a mass of refrigerant 25% mass of R-134a refrigerant, the performance of the refrigerator increases. Electricity consumption is more efficient with a marked decrease in electrical power requirements to 12.2%. In addition, the freezer room temperature is lower at 6.9 0C compared to when operating with R-134a working fluid.