GLHEPRO was developed as an aid in the design of vertical borehole-type ground loop heat exchangers used in geothermal heat pump systems. While GLHEPRO may be used for residential system design, it is aimed at commercial systems. The heat exchanger may be composed of any number of boreholes arranged in various configurations.

GLHEPRO performs three different tasks: (1) Simulation (for up to 100 years) of ground loop heat exchangers to determine monthly average and peak heat pump entering and exiting fluid temperatures, as well as power consumption of the heat pump. (2) Determination of the required borehole depth to meet user-specified minimum and maximum heat pump entering fluid temperatures. (3) Sizing of hybrid ground source heat pump (HGSHP) systems by determination of the required borehole depth and necessary supplemental heat rejecter (cooling tower, fluid cooler) or heat extractor (boiler) size.