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The heater was switched on for 60 minutes during a warming up process without any air flow, and then a stream of air (wind) parallel to the surface of the test wall was produced. Its speed was measured by a hot wire anemometer, EXTECH brand, model 407,123. Once the temperature readings stabilized (the transitional stage ranged from 330 to 1820 seconds depending on the material, wind speed and position of the wall), the sensor system was moved vertically in regular steps of 1.5 mm above the surface of the wall. To estimate the convective heat transfer coefficient, we applied Eq. (1), where the temperature values were the average of the sensor system readings.