A smaller carbon footprint than traditional heating and cooling systems, shallow geothermal systems are becoming more and more popular. To prevent over exploitation and detrimental effects on already-existing structures and installations, shallow subsurface exploitation for geothermal applications needs to be carefully considered. Our project examines the thermal impact of installing a groundwater heat pump in a district in Milan where geothermal systems already exist because of the presence of a shallow aquifer. The system, which consists of abstraction and reinjection wells screening in the shallow unconfined aquifer, will supply homes' needs for heating, cooling, and hot water. Geological and hydrogeological data that was already available was examined to create the conceptual model using finite-element modelling FEFLOW to construct a numerical flow and heat transport model.