RE2020 Thermal Study
Limoges, New Aquitaine

In Limoges, thermal studies are conducted in zone H1c, the coldest in the area where we operate, on medium-altitude terrain where heating demand remains the dominant item of the balance sheet and where the heating season is appreciably longer than on the Mediterranean arc. The old granite building stock, with high thermal inertia and low thermal resistance, calls for renovation strategies that address vapour migration as much as heat loss. The presence of a district heating network and a structured timber supply chain also opens up favourable levers on the RE2020 carbon indicator, which we build into the calculation from the earliest scenarios.

Summer comfort is the sticking point of the RE2020 in Limoges: 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.