The in situ thermal performance parameters for the North and East facing wall for the three selected locations on the test walls are presented in Tables 2 and 3. The thermal transmittance (U-value) values in Table 2 show that they are higher towards the side of the wall (measurement locations 3 and 6) compared to those for locations close to the center of the wall. This is because of the fact that the measurement locations 3 and 6 towards the side of the wall are close to a joint between two interlocked wall panels resulting in a higher U-value. Moreover, it is also observed that the East facing wall has higher U-values when compared to the U-values of the North facing wall for the corresponding measurement locations. The East facing wall is exposed to solar radiation for a longer duration than the North facing wall which results in a higher heat flux through the East facing wall. Fig. 20 shows the historical wind rose diagram for the city. It can be seen from the figure that the city has predominantly northerly winds.