Ground-source refers to a type of renewable energy system that harnesses the natural heat stored in the ground. This heat can be used for heating buildings or generating electricity. Ground-source systems, often called geothermal energy systems, utilize a series of underground pipes filled with fluid to absorb heat from the earth. These systems are efficient and environmentally friendly, as they rely on the stable temperatures found below the surface rather than burning fossil fuels. By tapping into this natural resource, ground-source technology can significantly reduce energy costs and lower greenhouse gas emissions, contributing to a more sustainable future.