Nowadays, it is essential to harness the potential of the Internet of Things (IoT) to improve people's well - being. In this context, a project was carried out to achieve autonomous thermal comfort in closed environments, using a web page and a mobile application for data entry and monitoring of thermal comfort. These systems are connected to a REST API, created under a single database for greater control and efficiency in automation. The database is linked to an ESP32 - S3, which in turn connects to sensors that collect data every minute and enter it into the database. Thermal comfort indices are then calculated using mathematical formulas. A significant advantage is that the ESP32 - S3 - WROOM allows monitoring from anywhere in the world via the Internet. By analyzing the data according to ASHRAE 55 standards and the PMV, PPD, SET and TCI indices, it was p ossible to demonstrate that t...