Abstract: A portable, open-loop, water source geothermal heat pump unit adapted to be connected with non-permanent, non-plumbed connections to convenient water supply/discharge points such as multi-use faucets and drains in a home supplied with well water. The unit is further adapted to be supplied with power from an electrical outlet using a simple plug-in cord. The heat pump unit may be installed independently of any existing furnace system, for direct or “space” heating of a room from which it draws intake air and directly vents heated air. The heat pump unit may also be ducted to heat another room from the one in which it is installed, and may further be ducted in parallel to an existing furnace ductwork for a duct-connected heating combination with the furnace.