Today, environmental, social and governance issues in geographic environments are at the forefront of hospitality companies' agenda due to the increasing pressure of stakeholders regarding the adverse social and environmental effects of tourism companies' actions. The purpose of the preliminary study is to examine the benefits of sustainability certificates for businesses, their impact on the financial performance of hospitality companies, and it is not clear at the level of the competitive set (compost). To fill the above gap in the literature, this study used the data of Parsian Hotel - Chaharmahal province and Bakhtiari as a green hotel. To compare the impact of sustainability certificates on key performance indicators in the hotel to its comp (eg, occupancy, average daily rate, revenue per available room). Methodology In this study, we used various random effect models to test our hypotheses to determine whether receiving certification improves hotel performance, whether hotels should respond to a hotel receiving certification, and whether the order of response and timing of response Does it matter or not? Our sample consists of an unbalanced panel dataset of 51,625 monthly observations from the standard-certified Parsian International Hotel located in Chaharmahal and Bakhtiari province. We chose Parsian International Hotel based on the previous confirmation and greenness by several studies that this province is a tourist destination as the eco pole of the nature tourism museum and the said hotel includes all levels. Our findings suggest that certified hotels can enhance themselves compared to competitors through first-mover advantage. In conclusion, this study provides significant contributions to the literature on environmental management and competitive dynamics in the hospitality industry. We provide managers with guidelines on when to respond to other hotels in their competitive portfolio when receiving sustainability certification.