Heating system with a thermal pump

In a heating system with a thermal pump, including an evaporator section consisting of a piping network buried in the ground, a compressor for compressing the evaporated working fluid, a condensing section operating as heating plant, and a translucent screen for shielding the ground against the atmosphere, such that a heat storage of the heat radiated from the sun and penetrated through the screen is provided and the space defined between the ground surface and the screen forms an insulation against heat loss to the atmosphere, said screen being a sheet-like material with perforations for discharging any accumulated water thereon, the improvement comprising that the distance between adjacent buried pipes of said piping network is less than 80 centimeters and the depth of the buried pipes of said piping network is less than 80 centimeters.