Energy efficiency is a key topic in modern society, because the growing number of households and industrial needs leads to increased energy consumption, which causes serious environmental and economic challenges. Household appliances, as significant consumers of energy in every household, become a critical point for reducing total energy consumption and greenhouse gas emissions. The topicality of the topic stems from the fact that we face increased demands for energy in our homes every day, and this trend will continue with the growth of the population and the development of technology. Therefore, it is necessary to find sustainable solutions that will enable rational use of energy and environmental protection for future generations. Improving the energy efficiency of household appliances is a simple and economically profitable way for every household to contribute to this goal. By monitoring trends in production and consumer habits, it becomes clear that awareness of the importance of energy efficiency is constantly increasing. Considering this, an increasing number of producers and consumers are turning to sustainable and energy-efficient solutions, which confirms the importance of the topic in today's context. The European Union plays a key role in the promotion of energy efficiency, setting guidelines and targets for reducing energy consumption through its policies and directives. These measures have significantly influenced the policies of member states, including Croatia, which is actively implementing national action plans to increase energy efficiency. This is especially reflected through the encouragement and subsidization of the purchase of energy-efficient appliances, the renovation of residential buildings, and the education of citizens about the importance of this topic. Croatia, as a member of the EU, recognizes the importance of sustainable energy consumption and actively participates in efforts to achieve the set goals of the Union in this area. The aim of the work is to investigate how increasing the energy efficiency of household appliances affects household energy costs. The research is based on the availability of relevant sources of data on the energy consumption of household appliances, technologies for increasing efficiency and the costs of applying these technologies. The paper analyzes how innovative technological solutions in household appliances can provide long-term savings for users, but also how these savings are reflected in the wider economic and ecological picture of society. In addition, the potential for further technological improvements in the context of durability and economic viability for the average household is considered.