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If we compare the values in Table 3 with those proposed by the Mexican standards (Ministry of Energy, 2001), it is possible to see a substantial difference (200 - 400%). However, the values in Table 3 are similar to experimental data reported in some international studies for flat plates and a wind velocity interval of 1-5 m/s (Hagishima and Tanimoto, 2003; Sharples and Charlesworth, 1998). Sartori E. (2006) makes a comparison between several of the experimentally obtained equations currently used for convective heat transfer coefficients in flat surfaces and, based on the principles of boundary layer theory, suggests an equation that tries to reach a consensus between all the results. Using this equation, Sartori evaluates the convective coefficient for a wind velocity interval of 2 - 5 m/s, and the results range between 4 and 25 W/m2K, which is consistent with our data.