The claim I have heard is, because the boreholes are such a huge portion of the cost, it comes down to the local talent base for drilling. If you live in an are

The claim I have heard is, because the boreholes are such a huge portion of the cost, it comes down to the local talent base for drilling. If you live in an area full of deep rural wells and fracking, the expertise is plentiful. But if you live somewhere with no drilling activity, it will be too expensive. Horizontal loops are much simpler, but require more land area than your typical suburban plot.