Abstract: A heat pump is equipped with a plurality of sensors configured to measure various physical properties, including but not limited to: (gas/liquid) temperature, (gas/liquid) pressure, electrical current, and/or flow rate. A monitoring center is interposed between the heat pump and other elements of a Heating Ventilation and Air Conditioning (HVAC) system, such as a building thermostat and a heat pump control board. The monitoring center receives the outputs from the sensors and communicates them to a user (e.g., via a wired or wireless interface) for inspection. The monitoring center may also process the sensor data to calculate and output desirable performance metrics such as efficiency and/or available capacity. Where the heat pump is part of a ground source heat pump (GSHP) system or a geothermal heat pump system, embodiments may be particularly useful to also receive and/or process additional sensor input(s) from a flow center component.