The article explores using heat pumps to heat a public building by using natural energy like air or ground as a heat source. The goal was to compare air-to-water and ground-to-water heat pumps to see which is more efficient and cost-effective. These pumps work by taking heat from the environment and transferring it to the building using electricity. The study found that both types of heat pumps have their benefits, but the ground-to-water pump may offer more energy savings in the long run. By analyzing the technical and economic aspects, they could determine the overall effectiveness of these heat pump systems for heating public facilities.