The subject of the project is thermomodernisation and modernisation of the building of Primary School No. 11 at ul. Skłodowska 4 in Tychy. The scope of the project includes, inter alia: — insulation of external walls with EPS styrofoam thickness of 15 cm, – warming of basement and foundation walls and plinth with extruded polystyrene XPS thickness of 12 cm, – execution of a band drainage around the building, – insulation of the edgings with mineral wool thickness 25 cm (ventilated straddles) and styropas thickness 25 cm (full straddles), – replacement of central heating installations with radiators and water-channel installations, – execution of mechanical ventilation with air heating and heat recovery in cellars, – replacement of electrical and lightning installations, – replacement of lighting fixtures throughout the school building with energy-efficient LED luminaires, – renovation and modernisation works, – land development. The investment will result in an annual CO2 reduction of 177.09 t and PM10 by 0.016 t.