Cost to Install Geothermal HVAC in because of the financial saving in the long run. Such systems will save a lot of money in heating and cooling costs as they use stable ground temperatures to save energy. Also, geothermal systems are long-lived and ground loops are more than 50 years. Homeowners can save the cost of installation in the long run as they pay less on utility bills, so it is an environmentally friendly and cost-effective alternative.