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The purpose of reducing cost and energy and gaining a better Coefficient of Performance (COP) leads to the study for the improvement of designing and innovating different refrigeration cycles and their combinations. Researches are carried out on a hybrid cycle based on the VCR-VAR system. Different types of refrigerants are analyzed to get maximum performance keeping the environment in mind. Different designs are made to improve the waste heat recovery to gain a sustainable system. Also, hybrid systems coupled with power cycles can reduce the external power demand have been studied. According to the studies, improvement in terms of COP, costs, energy-saving and environmental friendliness is gained. In this study, summaries of various studies regarding the thermo-economic analysis of the VCR-VAR system are provided, keeping the environmental aspects in mind.