Together with the research and development staff of Continental Automotive Czech Republic s.r.o., a tool for speeding up the design of thermal sensors and their optimization was developed. In the thermal sensors design, it is necessary to ensure their fast response to the fullest possible extent of the operational parameters such as changeable ambient temperature given by the climate change or rapid change in temperature of the measured operating fluids. The response of the sensor is affected by both the material properties of its individual components and its geometry itself. In order to set the optimal parameters for the individual components and assess the effect they have on the total response time, an automated tool based on the open source ESPRESO library was created.