The efficiency of a ground source heat pump is often referred to as its Coefficient of Performance (CoP) or as a Seasonal Performance Factor (SPF). The CoP is the performance of the heat pump at a stated ground temperature and flow temperature, whereas the SPF reflects the performance of the GSHP over a year.
A correctly sized ground source heat pump and collector array for a well-insulated home will be around 400 – 500% (SPF of 4 to 5) efficient, this means that for every 1kW of energy put into the ground source heat pump, between 4 to 5kWh of energy is delivered.
As part of the system design, Fervo will advise you what the SPF of your ground source heat pump will be and what it will provide an estimate as to what it will cost to run.