At the design stage, knowledge of the intrinsic properties of materials is one of the first inputs needed to estimate energy consumption and thermal comfort. Some properties can be measured in the laboratory on small samples, under highly constrained temperature and humidity conditions. In any case, these measurements never take into account the actual composition of a wall and the hazards of full-scale of the construction system. Measurements in a guarded hot box apparatus (HB) make it possible to take them into account. The HB is an experimental system consisting of two climatic chambers controlled in terms of temperature and relative humidity. HBs are ideally adapted to large specimen, more representative of the building scale. It is then possible to study real material assemblies under conditions close to in situ conditions. In this work, we present a recently developed experimental protocol for monitoring the dynamic thermal behavior of a new material enabling us to measure its thermal properties under realistic experimental conditions. This approach has been tested with an innovative construction system with earth concrete with wood chips.