The potential evapotranspiration was estimated using different mass transfer-based models and was compared with the Food and Agriculture Organization Penman-Monteith model. The results showed that the Albrecht model estimates the potential evapotranspiration better than the other models in the most provinces of Iran (23 provinces , 12-26°C, 18-30°C, 5-21°C, and 2.50-3.25 m s −1 (with the exception of Penman) for solar radiation, mean temperature, maximum temperature, minimum temperature, and wind speed, respectively. The results are also useful for selecting the best model when researchers must apply mass transfer (humidity)-based models on the basis of available data. In addition, the designed maps and categories are applicable for considering the role of climatic parameters in architectural evaluations over Iran.