Comment by throwaway2037

    > 100 meter borehole into the ground

I have heard from a couple of different Swedes talking about when this was installed in their childhood/high school years. It must be reasonably common at this point in Sweden. Are there special machines that pull up to your home and bore a deep hole? That seems like very specialised work for the average contractor! Also, does the gov't offer subsidies from this (presumably) expensive home improvement?