Geothermal company: Where / how to find

I have searched the internet and this forum for companies that can assist me with the planning and implementation of geothermal energy with collectors or alternatives. Unfortunately, I can't find anything. What should I be searching for? I need someone who serves the district of Freising (Obb.). Since there is no [LW heat pump] that has been created according to the heating load calculation of my heating engineer and is eligible for funding, I want to use geothermal energy. Hot water is a bit too uncertain for me. Any ideas?

From the rather northern part of Bavaria, I know the company erdwärmeplus. Just had to inquire, but to my knowledge, they serve all of Bavaria.

If you are looking for drilling companies, you just have to look in the Yellow Pages under well builders/drillers; they usually also drill probes.