The Hybridbox® is an innovative energy center that combines all energy disciplines in one building. It enables the climate-friendly coverage of heat requirements for heating and domestic hot water, even with high flow temperatures, and is also able to offer building cooling or waste heat utilization with one and the same system. The Hybridbox® can produce additional electricity in winter, precisely when conventional heat pump systems require the most electricity. The Hybridbox® is primarily optimized for use in heating renovations. However, with an appropriate energy concept, it can also be used in new buildings. The Hybridbox® is the optimal technical solution for reducing CO2 emissions when the building shell cannot be re-insulated during renovations or when this is not economically viable. The renovation of the existing property portfolio is decisive for implementing the energy strategy. With the Hybridbox®, a purely technical renovation is now available as an alternative to building shell renovation. The Hybridbox® is an ideal element in the concept of sector coupling thanks to the options of obtaining electricity from the grid on the one hand or producing electricity for heating in winter. The Hybridbox® is patented and is available in two standard sizes.