GEOFRAC is a 3D Discrete Fracture Network (DFN) model developed at MIT. Recent research developments based on GEOFRAC results in GEOFRAC-FLOW and -THERMAL, which simulate the flow and heat transfer in the DFN, respectively. This paper presents the development of GEOFRAC-FLOW and -THERMAL, and summarizes the inputs for the GEOFRAC package. A study on the Fenton Hill Project is used to demonstrate the applications of the GEOFRAC package in simulating the flow and heat transfer in a stimulated hot dry rock reservoir. A case study on the Námafjall geothermal field is used to show how GEOFRAC simulates the flow and heat transfer in a conventional geothermal reservoir. Both of the case studies provide reasonable results for flow rates and temperature in the reservoir.