Near-surface geothermal energy is the use of geo- thermal heat from a depth of down to 400 m. From a geological perspective, all residential and commercial properties are suitable for geothermal heating. Of course, economical, technical, legal and, last but not least, geological aspects must be taken into account.
The key factor is the ambient heat extraction capa- city through the ground probe. Dense and solid granite has excellent properties for such use thanks to its high specific weight and thermal conductivity. In contrast, looser and dryer gravel and sand formations noticeably reduce the flow of heat to the probe.
The number of probes per construction project depends on the heat required for the building and the geological condition of the solid ground. The building should have good insulation and low-temperature radiant panel heating should be employed to provide an optimum environment.