This paper provides newly developing information about the testing procedure and the corresponding electrical safety regulation of household refrigerators/freezers using hydrocarbon as the refrigerant for compressors. The authors surveyed around Taiwan and other countries, including Japan, USA, Europe Union, and Mainland China. Several media were collected and applied from some websites, reports, literature papers etc. Some updated energy efficiency regulation and proceeding for the previous described countries are also discussed. Finally, the novel technology around the world, open literature review over one decade and design topics for the HC system design were all described to make up the useful database for the future development of hydrocarbon refrigerators/freezers.