The thermal renovation project of the Trigan residence in Villenave d’Ornon built in 1967 and comprising 88 collective housing units (3 buildings) is part of this approach. This operation is part of a global rehabilitation of the residence and the construction of 7 complementary housing units. The objective of the thermal renovation of the Trigan residence is to increase the energy performance of the residence in order to improve the comforts of tenants without any increase in rent. In terms of energy performance, this project aims, after work, to the primary energy coefficient of 89.6 kWhep/m².an (energy label B) which could represent a gain of 137.1 kWhep/m².an.