Energy efficiency in buildings is essential for promoting environmental sustainability and reducing greenhouse gas emissions. With the increasing global demand for energy-efficient solutions, innovative technologies are fundamental. This project, developed during an Erasmus at the U. Politécnica de Madrid, aims to design advanced energy systems for a residential complex comprising 63 apartments and two swimming pools. The objective is to fulfill the building's thermal demand through cutting-edge energy solutions. The study focuses on technologies with the potential to transform energy self-production in buildings. Hybrid solar panels, which combine photovoltaic and thermal collector functions to produce electrical and thermal energy, air-water heat pump and thermal energy storage systems are central to this approach.