This paper presents a study on the determination of wall surface transmission coefficients, the properties of the air gap used in building insulation and temperature profiles in walls. The property values show that the air gap is a good insulator if its thickness does not exceed 4 cm. When the faces of the walls are doubled, we observe a decrease in the values of the surface transmission coefficients of the walls. This reduction in these coefficients is considerable when the double faces of the walls are insulated from an air gap. The lowest coefficient value (1.45 W.m-2.K-1) is obtained with the clay-paper-cement (TPC) and clay-paper (TP) wall. The study of temperature profiles in the different wall types was made with COMSOL software. The temperatures of the inner faces of the various walls are about 27 °C for outside temperatures of 40 °C or 35 °C, a decrease from 22.86 % to 32.50 % of the
values.

Optimization, air gap, Thermal insulation, Double wall, Surface transmission, Temperature