Regulation (EC) No 106 / of the European Parliament and of the Council of 15 January 2008 on the EU Energy Efficiency Marking Programme” is an important document that has become the basis for energy efficiency policy formulation in the European Union countries. This regulation, adopted on January 15, 2008, is not just a set of rules, but a whole philosophy aimed at improving the quality of life of citizens and protecting the environment. It was an important step towards creating a sustainable future where each of us can contribute to the conservation of the planet’s resources. The book will be of particular interest to those working in the field of ecology, energy, as well as to all those who seek to understand how the energy efficiency labeling system works in Europe. It will become an indispensable source of information for students and specialists in the field of energy, ecology, economics and law. It is also worth reading to business representatives who want to adapt to new requirements and standards, as well as to those who are interested in modern trends in the field of sustainable development. Regulation (EC) 106/2008 addresses key aspects relating to energy performance labelling of various goods and services. This applies not only to household appliances, but also to building materials, vehicles and even entire buildings. The book explains in detail how labeling helps consumers make informed choices and manufacturers improve their competitiveness. An important aspect is that the regulation not only sets requirements, but also creates a reward system for those who seek to improve their energy efficiency performance. The topics raised in the book cover a wide range of issues, from the economic and social implications of implementing energy-efficient technologies to the legal aspects related to compliance with norms and standards. It is important to note that this regulation has become the basis for further initiatives and programs aimed at reducing the carbon footprint and the transition to more sustainable energy sources. Readers will be able to see how this document has influenced the development of legislation in the field of environmental protection and what changes it has brought to the lives of Europeans. The style of the authors working on this book is clear and accessible. They strive to bring complex legal and technical aspects to a wide audience, which makes the text understandable even for those who do not have a special education. This allows readers not only to