Building form has a great influence on energy conservation and a correct architectural design can play a significant role in this field. Shading and its impact on thermal comfort of the residents are among the concepts which are of great importance in the subject of buildings' architectural design with regard to the regional climate. In this paper, an attempt was made to analyze the thermal behavior extent of these semi-open spaces in residential complexes of Mashhad County with the help of ENVI-met software. Therefore, the present paper, which is based on a simulation approach, investigates and analyzes the thermal comfort in semi-open spaces. By comparing different models simulated with ENVI-met software, it can be found out that none of the investigated models achieve the thermal comfort conditions on the day of the summer solstice, but the double-closed model, located on the central side of the building, provides the maximum amount of thermal comfort conditions at a rate of 6 hours on the day of the winter solstice. After this model, the one side closed ones, located in the central side of the building, and three sides closed ones, located in the western side of the building, provide the most thermal comfort time. The weakest models in terms of the duration of providing thermal comfort conditions are the one sided closed and double-closed models located on the west side of the building, which never provide thermal comfort conditions during the summer and winter solstice days.