The article analyzes modern technologies and materials for insulation of external walls of buildings, which play a key role in improving the energy efficiency and sustainability of building structures. Various types of thermal insulation materials, such as mineral wool, polystyrene, polyurethane foam and ecowool, their characteristics, advantages and limitations are considered. Attention is also paid to modern methods of installing thermal insulation, including ventilated facades, wet method and spraying. The article discusses current trends in thermal insulation, such as the use of "smart" materials and the integration of solar panels with thermal insulation. Emphasis is placed on the importance of choosing optimal solutions depending on climatic and operational conditions, as well as on the impact of modern technologies on energy saving and environmental sustainability of construction. The article is intended for specialists in the field of construction technology and architecture, as well as for researchers studying the energy efficiency of buildings.