Refer to the Retscreen website for access to Ground-Source Heat Pump Project Model. The RETScreen Ground-Source Heat Pump Project Model can be used world-wide to easily evaluate the energy production (or savings), life-cycle costs and greenhouse gas emissions reduction for the heating and/or cooling of residential, commercial, institutional and industrial buildings. The model can be used to evaluate both retrofit and new construction projects using either ground-coupled (horizontal and vertical closed-loop) or groundwater heat pumps.