Technically they can be installed geothermal in most single-family homes. There just needs to be on the plot to dig geothermal hoses down. But it is your municipality must give you permission. Talk to your local GeoHeat installer that helps you on your way.
Do you live in an area of connectivity required for district heating or natural gas? Then you might also get geothermal energy. One your house a low-energy, satisfying the requirements of energy class 1 and 2, you normally claim exemption. With it in hand to get rid completely of connecting service. Your local GeoHeat installer can guide and help with paperwork, so you get a good start.