The ground-source heat pump industry is focusing a great deal of effort on reducing system first cost. For the most part, this effort has been directed at ground-coupled systems. This paper explores two other ground-source system types (hybrid and groundwater) and compares their costs to ground coupled systems. Costs were developed for the three system types over a range of soil temperatures, well depths, building load characteristics and other parameters. Results show that reductions in capital cost of 20 to 80% can be achieved with hybrid and groundwater systems compared to ground-coupled systems