A ground source heat pump or heat exchanger is a system that pumps heat from the beneath the Earth's surface to provide heat in winter and works in reverse in the summer to cool.
They often work through a system of pipes buried under in the soil that transport the heat through a mix of antifreeze and water which it absorbs as it gets pumped around. The ground, below a depth of about 4 feet, remains at a relatively stable 10-12 degrees celsius throughout the year.
