This book explores the design, construction, and performance of zero-energy cooling chambers using natural, locally available materials like cocopeat, sand, sawdust, and gunny bags. Built on the principles of passive evaporative cooling, these chambers offer an eco-friendly, low-cost solution for preserving perishable items such as fruits, vegetables, dairy, and flowers in rural areas without electricity. Through detailed design guidelines, experimental data, and practical insights, the book demonstrates how such chambers can maintain temperatures 10-14°C lower than ambient, significantly...