People from all walks of life use it and enjoy it. Architects and engineers use it to design efficient, healthy buildings and plants. Property managers and plant operators use it to reduce their utility costs, to solve comfort problems, and to increase equipment reliability. Property owners and administrators use it as a financial tool to manage utility costs. Government agencies and code officials use it to understand conservation laws.
Students use it as a textbook in energy management courses and as a guide to environmental projects.
Faculty and writers use it as a complete sourcebook. It is the most complete book on energy efficiency. It has 1,536 pages. It is three inches thick, with a hard cover. It weighs over eight pounds, but it requires no batteries or external power, and you can read it even in bright sunlight.