The challenges the world is facing are becoming increasingly problematic. They are reflected in the environmental and energy crisis, climate change and economic development. The need to turn towards sustainability resulted in the emergence of the sustainable development paradigm. Sustainable development is a concept that aims to establish and achieve sustainable economic development, build a fair society and protect the environment. Ensuring sustainable forms of consumption and production, that is, sustainable management and efficient use of natural resources is one of the goals of the sustainable development program. Energy efficiency is the most effective way to achieve the above and it implies responsible use of energy, that is, the use of a sufficient amount of energy needed to complete an activity. Considering its solar potential, Croatia has an enviable predisposition for harnessing solar energy, contributing to energy independence, pollution reduction and environmental protection. The Wüstenrot housing savings bank offers a product designed to achieve energy efficiency by installing solar panels. Conducted research results indicate a strong interest in this way of utilizing solar energy. However, familiarity with the offer aimed at achieving energy efficiency has not been confirmed.