When my partner Bob & I looked into geothermal heat pumps we were shocked by the cost of purchase & installation. The biggest expense is the excavation for the underground loop system. A series of pipes are buried in the backyard to take advantage of the relatively stable year round temperature found underground. This loop system can be expected to last upwards of fifty years or so. The actual heat pump is installed inside the home, protected from the elements, & should last a minimum of twenty years. This is a much longer lifespan than conventional heating/cooling equipment. The heat pump draws from the free underground energy source, & particularly produces more units of energy than it requires to operate. Bob & me can maintain perfect year round temperature for right around a dollar a day. The much lower cost for temperature control should salvage the higher initial investment within many years. I like that the heat pump is extremely quiet, disinfect clean & safe. It provides both heating & cooling & maintains truly even temperature. Plus the geothermal system effectively handles Summer humidity & doesn’t overly dry out the indoor air in heating mode. All in all I am happy with what we chose to go with this heat pump. We are very happy with it to date!