1. IEA, Tracking Buildings 2021, Available at: https://www.iea.org/reports/tracking-buildings-2021, 2021.
2. Qiao, Z., Long, T., Li, W., Zeng, L., Li, Y., Lu, J., Cheng, Y., Xie, L., & Yang, L., 'Performance assessment of groundsource heat pumps (GSHPs) in the Southwestern and Northwestern China: In situ measurement,' Renewable Energy, 153, pp. 214-227, (2020).
3. Miara, M., Gunther, D., Kramer, T., Oltersdorf, T., Wapler, J. Heat Pump Efficiency Analysis and Evaluation of Heat Pump Efficiency in Real-life Conditions, pp. 1-44. Available online: https://wp-monitoring. ise.fraunhofer.de/wpeffizienz/download/final_report_wp_effizienz_en.pdf, 2011.
4. Wang, X., Li, Z., & Li, D., 'Energy Efficiency Analysis and Evaluation of GSHP in Operation,' Procedia Engineering, 205, pp. 1364-1369, (2017).
5. Mustafa Omer, A. 'Ground-source heat pumps systems and applications,' Renewable and Sustainable Energy Reviews, 12(2), pp. 344-371, (2008).