Cities, as highly built-up areas, are more vulnerable to the heat island effect and expose the large number of people concentrated there to the negative effects caused by warm temperatures. Planning green and blue areas is an intervention that contributes significantly to reducing the UHI by improving microclimate comfort conditions.The benefits of such interventions are therefore objective and necessary to make cities more liveable: quantifying the heat mitigation capacity of urban green spaces and comparing the different design solutions is essential for optimizing planning decisions. Due to the complexity of the tools and the difficulty in finding specific data, the use of such instruments remains limited to a few applications by technicians and specialists. The InVEST 3.15.0 Urban Cooling model overcomes this obstacle by using easily available parameters, associated with a land cover map, to calculate, as output, a heat mitigation index (HMI) of green and blue elements in the surroundings. The aim of this study is to evaluate the cooling capacity provided by the urban park through the application of the InVEST model, comparing different design and time scenarios within the Ferruccio Parri Park in Cuneo. In particular, the work intends to quantify the combined effect of vegetation and water on the park’s microclimate. The results show how the model is sensitive to the variation of vegetated land cover and to the increase in tree canopies, while the contribution of water in heat mitigation is not relevant under the simulated conditions.