In this work, an experimental study was conducted with the aim to finding out the influence of earthen brick buildings adapted to the local climate, and blocks on indoor air quality during the first hours of work in 15 office buildings. It was concluded that the type of season is not the more important parameter, despite the tendency towards similar ambiences during the rainy season. On the other hand, a clear difference between new and old buildings with plaster coatings during the occupation period was shown. In particular, a better indoor ambience during occupation in the old buildings was seen. At the same time, when the marble and plaster coating in old buildings was analysed, a clear difference in indoor ambience behaviour was obtained during the office opening hour. In particular, a better indoor ambience was obtained during the dry period in the old buildings when marble coatings were em-ployed. When indoor relative humidity was analyzed, it was clearly defined as the group of new buildings under a significance value of 0.05 with an average value of 67%, and a standard de-viation of 1.67. At the same time, the old buildings showed an average relative humidity of 73%, and a standard deviation of 0.69 for a significance level of 0.97. The same effect, was obtained in new buildings with a marble coating during all the season.