## 5 Conclusions  
This research provides a successful and comprehensive approach to identifying the environmental inventory of the AC remanufacturing process. The life cycle approach was found to be accurate and efficient in dealing with this research query. This research conducted a life cycle environmental inventory assessment of a remanufactured AC. ISO 14,044 was used to guide the assessment process. It was found to be useful and helpful toward the achievement of the research objectives. The following conclusions can be drawn based on the conducted research:  
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* The life cycle approach was found to be capable in providing the accurate means to decide on the environmental performance of a product. In the example of AC, remanufacturing is very appealing when the comparison is based on the saved material and parts during the manufacturing phase. The assessment should be extended to include a complete life cycle, which was the approach followed in this research project
* The environmental impact suggested by GaBi was found to be useful and comprehensive when evaluating the environmental performance of the studied product. It provides consistent and accurate results.  
Figure 8: The use phase model using GaBi software.  
* Environmental impact software was found to be an efficient and accurate tool to conduct the inventory analysis.
* The developed life cycle model, with the help of GaBi, was found to be efficient in testing different scenarios. The developed model in this research is straightforward enough for a non-expert to run it and to obtain useful information, enabling them to make informed decisions.
* A new business model, based on a product service system, could improve the environmental performance of the new AC unit. A product service system helps manufacturers maintain control over their product through the entire life cycle.  
The environmental inventory was found to be highly dependent on the choices of machines and the methods of performing the activities of remanufacturing. Hence, process designers should consider environmentally friendly choices when they design a remanufacturing process.  
Conceptualization, A.Z., M.A., A.E.E.A.E. and B.S.; Methodology, A.Z., M.A. and B.S.; Software, A.Z. and M.A.; Investigation, A.Z. and A.E.E.A.E.; Resources, A.Z., M.A. and B.S.; Data curation, A.Z. and A.E.E.A.E.; Writing--original draft preparation, A.Z., M.A. and B.S.; Writing--review and editing, A.Z. and B.S.; Project administration, A.Z., M.A. and B.S.; Funding acquisition, A.Z., M.A. and B.S. All authors have read and agreed to the published version of the manuscript.  
This work was supported by the National Plan for Science, Technology, and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Saudi Arabia, under Award 15-ENE4953-02.  
Not applicable.  
All of the data are presented in the manuscript; for further information, please contact the corresponding author.  
The authors would like to thank the National Plan for Science, Technology, and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Saudi Arabia, for funding this work under Award 15-ENE4953-02.  
The authors declare no conflict of interest.