Abdulqadir, Ibrahim F., Badran M. Salim, and Omar Shamdeen. “Performance Investigation of Refrigerant R-407C As a Replacement to Refrigerant R22 in Window Air Conditioner Unit”. Journal of Civil Engineering Frontiers 1, no. 2 (December 31, 2020): 37-43. Accessed December 4, 2021. http://jocivilef.org/index.php/jocef/article/view/18.