Geothermal heat exchangers are systems that transfer heat between the ground and a building. They utilize the stable temperatures found underground to either heat or cool a space. In winter, they extract heat from the ground, while in summer, they can remove heat from the building and transfer it back into the cooler ground. These systems typically consist of a series of pipes buried underground, filled with a heat transfer fluid. As the fluid circulates through the pipes, it absorbs or releases heat, making geothermal heat exchangers an efficient and sustainable option for temperature regulation in homes and commercial buildings.