The subject of this project is the thermal modernisation of the 4 buildings of the Przasnysz Hospital, consisting of interconnected segments. The project is included in the “Investment Plan for the City of Ostrołęki and the Ostrołęcki Subregion.” as part of a bundle of projects of the Second Project “Improving the quality of life of residents of the Ostrołęki subregion...”, which co-funded with the Mazowieckie Voivodeship in the RIT formula. The project concerns the deep thermal modernisation of the Hospital’s buildings. It shall include: warming of outer partitions i.e.: walls, ground floor, ceiling in 2 buildings, replacement of windows and doors for airtight in all buildings, modernisation of the group heat node, solar collectors and ground heat pumps for central heating purposes, replacement of traditional lighting for energy-efficient LEDs with the installation of photovoltaic panels supporting lighting. The aim of the project is to increase the energy efficiency of buildings in the public utilities sector, improve energy consumption by the Hospital, reduce greenhouse gas emissions, diversify energy sources (warm and electricity), increase public awareness. The promotion of energy-reducing devices, in the case of hospitals, is particularly effective. Patients observe the applied solutions and energy effects – they promote and popularise them in their own environments.