A minimum of intervention inside the apartments and an optimization of the investment cost in relation to the energy savings achieved.

• Peripheral insulation of façades
• Installation of triple-glazed windows
• Installation of thermal solar panels
• Replacement of the oil-fired boiler with an air/water heat pump (100% renewable energy)

Significant reduction in the Heat Expenditure Index:

• IDC before renovation : 797 Mj/m2/year
• IDC after renovation : 288 Mj/m2/year