Thermal comfort is a condition of perception in which 80% of people in an environment have a desirable and satisfactory thermal sensation, which is defined by a feeling of satisfaction and contentment with the surrounding temperature. Because humans are not inactive in controlling the temperature conditions of their environment, they can adapt the thermal environment around them to their needs through the opportunities that the environment provides. Adaptability is a qualitative concept that greatly helps the user in providing comfort and achieving thermal satisfaction in physical, physiological, and psychological dimensions. To achieve thermal adaptation, the adaptive opportunities is defined as a set of solutions designed by the architect in the building, which allows the user to overcome the cold or heat of the air with the help of architecture. Since traditional Iranian buildings are an example of sustainable architecture, this article seeks to analyze a sample of historic houses in Isfahan, examine the role of adaptive opportunities in controlling environmental conditions in line with the Human activity and evaluate the impact of this factor on the Predicted Mean Vote (PMV). The method of this research, given its nature, is a combination of experimental strategies, case study, and simulation. The statistical population was purposefully selected from the Qajar era Kianpour and Belghis houses in the hot and dry climate of Isfahan to explain the opportunities for adaptation contemplated in these houses. Initially, the definition of thermal comfort and solutions based on increasing thermal adaptation of users were discussed through library and document studies. In this regard, hot and dry climate design solutions and architectural features of Qajar-era housing based on increasing the adaptive opportunities were explained. Then, Ecotect 2011 software and the Ladybug tools extension in Rhinoceros7 software were used to obtain the output of the PMV and simulate the current situation in two modes: using adaptive opportunities and not defining them. The results show that the use of architectural solutions that increase opportunities for adaptation by the user can have an impact on Predicted Mean Vote and the predicted percentage of dissatisfied as a dependent variable of the PMV. It is important to note that this effective difference in the simulation only shows the effect of limited use of adaptation opportunities such as the use of combined ventilation (increasing adaptive opportunity) or only natural ventilation (not using adaptive opportunity). If more solutions that increase the scope for adaptation, which have been explained in this study, are included in the design and used by users, it will increase thermal adaptation and reduce the percentage of thermal dissatisfaction of users. Utilizing architectural solutions to increase the scope for adaptation of users, not only in traditional houses in the hot and dry climate of Iran, but also in modern housing, plays a very important role in redefining the quantitative limits of thermal comfort. In this study, by using simulation, the effect of utilizing the adaptive opportunities can be well understood; the important point is to find solutions and approaches that are in line with the concept that in traditional Iranian buildings, compatibility with the climate can be visibly explored. By adding more of these approaches, the estimation of the increase in thermal satisfaction of users can be generalized to today's housing as well. In addition to what was said, according to the results obtained, suggestions can be made for improving the thermal conditions of historical houses (if they are renovated and reused) or modern houses. In winter, improving the insulation of buildings can help retain heat. Using more efficient heating systems or increasing the heating capacity of the current system can lead to a 15-20% improvement in the Predicted Mean Vote . Using passive solar methods for daytime heating in winter, improving shading in summer, using vegetation, using materials with high thermal capacity, optimizing the combined ventilation system with a focus on reducing humidity can lead to an improvement in the average thermal rating index. Finally, it should be noted that this simulation, limited to the north and south facing rooms, may not be fully representative of the thermal performance of the entire building. Factors such as humidity, air velocity and radiation that affect thermal comfort are not reported in these data and can have a significant impact on the results. However, this study clearly shows that increasing adaptive opportunities, energy optimization and improvement of heating systems in historic buildings is essential and can lead to significant improvements in the thermal comfort conditions of the occupants. Given what has been said, there are other studies and specialized areas in line with this research that can be measured and evaluated in future research as study topics in line with increasing the scope for adaptation in order to achieve thermal comfort and satisfaction.