The above-mentioned systems are to be supplied and installed in order to achieve a reduction in primary energy consumption in the building complex, in order to upgrade energy from energy class Z to the current state, to energy class A+. The energy upgrade of the building will lead to the reduction of operating costs and air pollution, as well as improving the internal comfort conditions for the workers and visitors of the building. Finally, this energy upgrade enables wider sections of the population to raise awareness and improve their environmental-energy behaviour.