Following talk of GSHPs... what's the best (DIY or "professional") way of
measuring the frost line during Winter and/or monitoring ground temps at
different depths? I'd like to get an idea of how useful a GSHP would be
around here and how deep the loops would need to be (figured I'd ask now
in case it's best to set something up before the ground actually freezes!).

Ideas on a postcard. Or just save paper and say here.

cheers

Jules