When comparing two heat pumps in a quote, the first reflex is to look at the price. The second should be to check the displayed COP. This indicator, the Coefficient of Performance, determines how many kilowatt-hours of heat a device produces for each kilowatt-hour of electricity consumed. Understanding what this ratio concretely means changes the way one reads a label, arbitrates between two models, and estimates heating bills over ten years.
COP and actual heating cost: the calculation that few quotes detail
On the ground, the COP primarily serves to convert an electricity price into a useful heat price. With a given regulated rate, a heat pump displaying a COP of 2 halves the cost of the kilowatt-hour of heat compared to a conventional electric heater. This is not a theoretical gain: the COP directly transforms the price of electricity into actual heating costs.
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It is quickly understood why professionals comparing gas, oil, and electricity systematically include the COP in their pricing grids. Without it, comparing energies is like comparing apples and oranges. With a COP of 3, every euro spent on electricity produces the equivalent of three euros of heat. To delve deeper into the meaning of the acronym COP beyond its common usage in climate negotiations, one must turn to applied thermodynamics.
This distinction is important: the acronym COP also refers to the Conference of the Parties, the annual UN climate summits. The two usages coexist, but in the field of domestic and industrial energy, COP refers to the Coefficient of Performance, a measurable and comparable efficiency ratio.
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Nominal COP vs Seasonal COP: what the label doesn’t always say
The COP displayed on a technical sheet is measured under standardized laboratory conditions, typically at an outside temperature of 7 °C for an air-water heat pump. In real conditions, this figure fluctuates.
When the outside temperature drops, the COP decreases. A heat pump that shows a COP of 4 at 7 °C can fall much lower in extreme cold. This is why professionals talk about SCOP (Seasonal Coefficient of Performance), an indicator averaged over an entire heating season.
Why SCOP is more reliable for sizing an installation
SCOP incorporates the climatic variations of an entire season. It reflects actual performance better than the nominal COP, which corresponds to a snapshot under ideal conditions. A high SCOP indicates a high-performing machine even in cold weather, which is particularly important in regions with harsh winters.
Feedback varies on this point among installers, but the trend is clear: relying solely on the nominal COP leads to overestimating savings. Checking the SCOP on the European energy label provides a more accurate picture of expected annual consumption.
COP and access to subsidies: a regulatory criterion, not just technical
The COP is not just a commercial argument. In France, it conditions access to several subsidy schemes for energy renovation. Energy savings certificates (CEE) and certain bonuses impose a minimum performance threshold for equipment to be eligible.
- A model with a COP below the required threshold is not eligible for any aid, regardless of its purchase price. The COP becomes a regulatory filter that excludes low-performing devices from the subsidized market.
- This requirement pushes manufacturers to offer ranges whose COP far exceeds the minimum. There is a ripple effect: regulatory thresholds pull the market average upward.
- For the individual, checking the COP before purchasing is not a technical luxury; it is a condition for not paying full price for an installation that could have been partially funded.
On the ground, RGE (Recognized Guarantee of the Environment) craftsmen check this point before signing a quote. If the chosen heat pump does not meet the threshold, they direct towards a compliant model, even if it means revising the budget upwards.
Reading a COP on a product sheet: concrete traps to avoid
Not all displayed COPs are equal, and confusion between hot COP and cold COP is common. A reversible heat pump displays two distinct COPs: one for heating mode, one for cooling mode. Comparing them makes no sense.
The most common mistakes on quotes
- Comparing the COP of an air-to-air pump with that of an air-to-water pump without considering that the measurement conditions differ (different source and distribution temperatures).
- Confusing COP and EER (Energy Efficiency Ratio). EER measures efficiency in cooling mode, while COP measures it in heating mode. A device can excel in cooling and be mediocre in heating.
- Ignoring the water inlet temperature. A COP measured at 35 °C water inlet will always be more flattering than at 55 °C, which favors underfloor heating compared to high-temperature radiators.
Asking the manufacturer or installer for the exact measurement conditions of the announced COP allows one to place the figure in its real context. A COP of 4 measured at a 35 °C inlet is not worth a COP of 3.5 measured at 55 °C: the latter is often more indicative of a robust machine.
COP and energy transition: why this indicator matters beyond housing
At the scale of the real estate stock, the average COP of installed heat pumps directly influences national electricity consumption. The higher the average COP, the less the electrical grid is stressed to produce the same amount of heat in buildings.
French regulations for new constructions already incorporate this logic. The gradual ban on gas in new builds pushes towards high-performing electric solutions, where COP becomes the sorting criterion between viable solutions and energy-consuming solutions.
In the industrial sector, the same reasoning applies to recovering waste heat. Energy savings certificate operations encourage the exploitation of this lost heat through systems whose COP guarantees sufficient efficiency to justify the investment.
The COP is therefore not just a number on a label. It is the ratio that determines whether a heat pump deserves its name, whether it qualifies for aid, and whether it truly reduces the bill. Before signing a quote, checking the SCOP, the measurement conditions, and the applicable regulatory threshold remains the best precaution to avoid turning an investment into disappointment.