Measured Heat Pump COP Calculator

How the measured heat pump cop calculator works

Coefficient of performance is useful heating or cooling output divided by electrical input on matching energy and time boundaries. With both inputs in kWh, their quotient is dimensionless. A zero electrical input has no calculated finite COP rather than an infinite result.

Declare whether useful output is heating or cooling, and include auxiliaries consistently. An instantaneous or short-period ratio is not automatically a seasonal rating. This tool does not predict field performance, establish equipment size or translate a different seasonal test metric into real COP.

Quantities use the stated units and finite bounded inputs. Whole purchases round up under the documented model; cost components round half-up to cents before totals are summed. Undefined ratios stay unavailable. π and logarithms use normal numeric precision. Display rounding does not alter the entered assumptions.

Worked example

30 kWh useful thermal output divided by 10 kWh electricity gives COP 3. Increasing useful thermal energy to 40 kWh at unchanged input gives COP 4.

Sources and assumptions

The source material explains the underlying calculation or pricing structure. Entered prices, costs, schedules and scenario choices are your assumptions; this tool does not obtain supplier quotes or predict actual results.

• DOE Heating and Cooling efficiency definitions