Geothermal heat pumps (aka ground sourced heat pumps) have a high initial capital cost. Their suitability also depends on the local dirt as much as the local c

Geothermal heat pumps (aka ground sourced heat pumps) have a high initial capital cost. Their suitability also depends on the local dirt as much as the local climate. You need good enough ground moisture levels to have a high enough thermal conductivity. Otherwise the cost of the hole becomes prohibitive.