In a smaller scale, this is also what the French solar panel manufacturer Dual Sun [^1] sell with their geothermal+hybrid panels solution for individual houses.

In a smaller scale, this is also what the French solar panel manufacturer Dual Sun [^1] sell with their geothermal+hybrid panels solution for individual houses. - In winter, heat is generated with a geothermal heat pump and an horizontal underground network of pipe. - In summer, the thermal solar excess energy is used to warm up the soil that has been cool down during winter and also to avoid permafrost. [1]: https://dualsun.com/applications/pompe-a-chaleur-solaire/ https://dualsun.com/applications/pompe-a-chaleur-solaire/