Evaluations of geothermal district heating (GDH) systems often focus heavily on the resource, central mechanical facilities and distribution piping. While it is true that these components do constitute the bulk of the capital costs for the system and without careful design of these components a system cannot brought to fruition, it is equally true that a system cannot be successfully developed without customers. In the world of simulation, virtual customers can be expected to connect to any system the modeler creates. Real customers however require a reasonable economic incentive to connect. In the small building size range typically found at most of the co-located sites, the economics associated with connecting to a geothermal district heating system may include some substantial economic hurdles for building owners