There is little in this world that cannot be improved through better management. Energy is no exception, thus the development of BEMS - Building Energy Management System'. Whether it is used to monitor the temperature inside, outside, compare and adjust or shut the boiler down, turn the coolers on, a BEMS can significantly add to the energy efficiency of a building. This book, written as an undergraduate textbook, will appeal to practising building services engineers and energy managers who wish to update themselves in a rapidly moving field of technology. Of particular interest will be the chapters on monitoring and targeting, direct digital control, and motivation and energy saving. Many organizations now have BEMS but its potential is not being realised because the users do not fully understand the BEMS or the heating systems that they control. This book will be a valuable reference for understanding and using building energy management systems.