In order to specify a single value of thermal transmittance (air to air) and thermal resistance (surface to surface) for each The results show that for the North facing wall, the U-values are in the range of 1.402–1.490W/m2 K with a mean of 1.459W/m2 K, and the Rvalues are in the range of 0.346–0.365m2 K/W with a mean of 0.355m2 K/W. For the East facing wall, the U-values are in the range of 1.772–1.821W/m2 K with a mean of 1.803W/m2 K and the Rvalues varied from 0.348 to 0.352m2 K/W with a mean value of 0.351m2 K/W. The results show that the mean thermal resistance values for the East and North facing walls do not vary much, in contrast to the mean thermal transmittance values. This is due the fact that the wall surface temperature is involved in the calculation of the thermal resistance (R-values), which takes into account the solar radiation to which the walls are exposed. The coefficient of variation of the thermal resistance for the North and East facing walls lies in the range of 0.56–2.64% which satisfies the ASTM C1155 [14] criteria of less than 10%.