energies Article A Study of Hot Climate Low-Cost Low-Energy Eco-Friendly Building Envelope with Embedded Phase Change Material Atiq Ur Rehman 1, Nouman Ghafoor 1, Shakil R. Sheikh 1 , Zareena Kausar 1 , Fawad Rauf 2,* , Farooq Sher 3 , Muhammad Faizan Shah 4 and Haseeb Yaqoob 4 1 ...