RE2020 Thermal Study
Paris, Île-de-France

In Paris, in climate zone H1a, the RE2020 is decided as much on envelope performance and heating demand as on a summer comfort that has become major with the multiplication of heatwaves and the urban heat island. On the dense Parisian stock, often undergoing heavy refurbishment, dynamic thermal simulation arbitrates between thermal inertia, solar shading and night-time over-ventilation to limit the recourse to air conditioning, and the carbon component strongly steers the choice of materials. We produce the RE2020 calculation, the STD, the ACV and the Bbio and completion certificates for Paris operations.

Summer comfort is the sticking point of the RE2020 in Paris: on exposed façades, the degree-hours (DH) threshold is quickly exceeded, all the more so in the south of France. Dynamic thermal simulation arbitrates between thermal inertia, solar shading and natural ventilation before the building envelope is fixed.