Existing literature on energy audits consists almost exclusively of practical guides. This book looks at energy auditing from a scientific perspective. It discusses the nature of energy audits and provides a universally applicable data model as a basis for automatic processing of a large number of energy audits. Qualitative aspects of auditing are discussed in detail. The modeling enables an improved evaluation of subsidy programs for energy audits, but also a systematic and teamwork-oriented creation of energy audits.