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EU-GUGLE Site Milano


Project status



Milan, the second-largest city in Italy and the capital of Lombardy has a population of about 1.35 million people. The area included as the Italian demonstrator of the EU-GUGLE project us called Zona 4 and is one of the nine administrative districts of Milan, located at the southeast border. With a surface of about 21 km2 the district has a population of 152 300 inhabitants. The project covers public residential buildings used for social housing and one public school.

For all the renovations carried out in the buildings in Milan, the action plan has three steps - improvement of building envelope to reduce the energy needs for heating and cooling of the building and reach higher levels of indoor comfort, improvement of the efficiency of the mechanical systems and production of energy from renewable sources to satisfy the remaining energy use. This approach would allow to obtain the optimal results in terms of energy savings, environmental impact and economic costs during the service life of the building and also to create a large and stable market with important volumes of activity for all the construction actors and building aspects. The EU-GUGLE project and the collaboration with the end-use Efficiency Research Group of Politecnico di Milano has motivated the City of Milano to create a new Technical office for energy efficiency.

Demo Site Expected Impact

* Information regarding technical and economic performance will be available at a later stage.

The targeted primary energy savings in Zona 4 are up to 82%. The design and implementation of the activities are a perfect case for devising, testing and fine-tuning innovative solutions to be replicated at the scale of the entire city.


Buildings and energy

* Information regarding economic performance will be available at a later stage.

The refurbishment measures implemented in Milan included:

Energy efficiency buildings 

  • Building envelope retrofitting
    • A great attention has been paid both by researchers and the technical staff in order to enhance the energy performance of the envelope of the buildings - checking insulation strategies, identifying and correcting thermal bridges, reviewing building systems control strategies and monitoring.The already carried out works show a reduction of the primary energy demand for heating and domestic hot water of the building, from more than 250 kWh/m2/yr to about 35 kWh/m2/yr
    • A child care center building will be retrofitted to passive house standard with prefabricated envelope elements, which will include thermal insulation, new high performance windows, automated external solar protections, automated night ventilation via windows and the two re-designed atria, room by room mechanical ventilation with winter heat recovery. The above technologies will allow to achieve summer comfort without mechanical compression cooling, good IAQ and winter comfort with energy needs lower than 15 kWh/m2y. Presently the building shows very poor comfort and IAQ levels.
  • Building services (HVAC & Lighting)
    • Savings obtained by the envelope retrofit are complemented by savings due to heat recovery on exhaust air and photovoltaic system
  • Building integrated renewable energy sources

Energy systems integration

  • Photovoltaics
  • District heating and cooling.


  • Building energy management system
    • Sensors for measurement - illuminance, CO2, temperature and humidity
    • Actuators for operation - lights dimmer and on/off switches, mechanical ventilations and winter heat recovery systems, upper windows openings for summer night ventilation, external solar protections and thermostat valve for heating system

Building aspects

  • Building Energy Services
  • DHW (only)
  • Building Energy Services
  • heating (only)
  • Building Energy Services
  • heating and DHW
  • Installed Renewable Energy Sources
  • photovoltaic
  • Installed Renewable Energy Sources
  • photovoltaic - building integrated
  • Technology used to supply the buildings
  • boiler
  • Technology used to supply the buildings
  • district heating (DH) network
  • Technology used to supply the buildings
  • heat pump: absorption

Thematic Field

  • Refurbished Building(s)

Feltrinelli 11

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Maura Gambarana
City of Milano