The building is situated at the address of the lukobran 5, 51 500 Krk, the building was built in 1968. The object is inadequate structural elements in terms of energy efficiency. The reconstruction of the facility and the installation of a high-efficiency heating and cooling system for the beneficiary will contribute to reducing annual primary energy consumption in the building (administrative building), improving user performance and reducing operating costs. The facility is expected to implement energy efficiency measures by installing thermal insulation on external walls, hairs, ceiling above the external air, and replacing the existing joinery with a new one, which will lead to significant savings in the energy consumption Qh, nd 31 889.44 kWh/a (71.97 %).