Coefficient of performance of heat pumps: what does it really mean?
At a time when the energy transition is at the heart of environmental concerns, understanding the efficiency of heating systems becomes essential. Among the solutions that stand out, heat pumps, particularly air-water models, are experiencing considerable growth. But what is the coefficient of performance (COP) of heat pumps, and why is it so crucial for you, as a user, to fully grasp it? This article aims to explore this fundamental concept, analyze its importance in choosing your heating system and provide you with the keys to optimize your energy consumption.
Definition of the coefficient of performance (COP) of heat pumps
The coefficient of performance (COP) is an indicator that measures the efficiency of a heat pump. It is expressed as a ratio between the thermal energy supplied by the pump and the energy it consumes in the form of electricity. For example, a COP of 4 means that for 1 kWh of electricity consumed, the pump produces 4 kWh of heat.
To better understand this coefficient, it is useful to note that the COP depends on several factors:
Outdoor temperature: The COP varies according to the ambient temperatures. When it is very cold, the pump has to work harder, which can reduce its efficiency.
Type of energy source: Heat pumps can use air, water, or the ground as a heat source. Performances can vary: for example, air-source systems tend to be less efficient than ground-source systems.
Installation conditions: A well-executed installation in an appropriate building also maximizes the COP.
Impact of COP on your choice of heat pump
When evaluating a heating system, the COP is a fundamental criterion. It serves as a crucial comparison factor between the different models available on the market. In 2025, users are encouraged to choose heat pumps with COPs ≥ 3, in order to ensure good energy efficiency while reducing operating costs.
Manufacturers such as Daikin, Toshiba, Mitsubishi Electric, and others, provide technical data sheets containing this information. To make an informed decision, it is therefore essential to:
Compare the COP under different temperatures, such as A7/W35, which indicates optimal conditions.
Consider the SCOP (seasonal coefficient of performance), which is more realistic as it is measured over a year and takes into account temperature fluctuations.
The importance of SCOP in the current context
The SCOP (seasonal coefficient) estimates the efficiency of a heat pump over a given period, usually a whole year. This coefficient shows how the pump performs in different seasons, making it more reliable than the COP. For example, a high SCOP means less electricity consumption throughout the year.
Currently, a SCOP greater than 4 is an indicator of quality for heat pumps. This implies that you can expect superior energy profitability, leading to significant savings on your electricity bills. Here are typical SCOP values according to pump types:
Type of heat pump | Average SCOP |
|---|---|
Air-source heat pump (air-water) | 2.5 to 3 |
Geothermal heat pump (probe) | 4 to 4.5 |
Ground-water heat pump (sensors) | 3.5 to 4 |
Factors influencing SCOP
As with the COP, several factors influence the SCOP of heat pumps:
Climate conditions: In a cold climate, the SCOP will be lower compared to that of a temperate climate.
Building insulation: Good insulation reduces heating needs, improves SCOP, and allows for savings on energy bills.
Heat distribution system: The choice of your radiator or underfloor heating system can also influence the SCOP.
Comparison of heat pump brands
To help you choose the right installation, let's examine the performances of different heat pump brands.
Brand | Model | Max COP | SCOP |
|---|---|---|---|
Daikin | Altherma 3 | 5.0 | 4.5 |
Toshiba | Estia | 4.6 | 4.1 |
Mitsubishi Electric | Zubadan | 4.1 | 3.8 |
Samsung | Smart Eco Heating | 4.0 | 4.2 |
By testing the efficiency of these brands, you will gain valuable information about their performances and the potential energy savings. The use of such equipment is justified both by its potential to reduce greenhouse gas emissions and by cumulative savings in the long term.
Which brands to prioritize according to your needs
Here are some tips to help you choose the brand of your future heat pump:
Atlantic: Specialized in hot water and ideal for well-insulated homes.
Thermor: Offers compact models, suitable for small spaces.
Fujitsu: Recognized for its high-efficiency equipment.
Chaffoteaux: Offers a flexible range suited to all needs.
Simple tips to optimize COP and SCOP
Even though the performance of your heat pump is important, it is equally essential to optimize their operation on a daily basis. Here are some ideas:
Set the thermostat to a reasonable temperature to avoid excessive consumption.
Ensure regular maintenance of your equipment: check filters and clean the outdoor unit.
Cover the outdoor unit in winter to protect it from the elements, which can help maintain good efficiency.
Install a timer to adjust the operation of the heat pump according to your presence schedule.
These small attentions can help maximize the efficiency of your heating system, all year round.
Conclusion
Through this article, we have delved into the concept of the coefficient of performance of heat pumps, whether it is the COP or the SCOP. These indicators are essential for evaluating the efficiency of your heating system and guiding you in choosing the equipment most suitable for your needs.
FAQ on the coefficient of performance (COP) of heat pumps
What is a good COP?
Generally, a COP greater than 3 is considered satisfactory for an air-source heat pump, while a COP greater than 4.5 is preferable for geothermal systems.
What is the purpose of the SCOP?
The SCOP allows for evaluating the efficiency of a heat pump over an entire year, taking into account temperature variations, which makes it more reliable than the COP.
What factors influence COP and SCOP?
Climate conditions, building insulation, and the type of heat source influence these coefficients. A well-insulated building with suitable emitters operates optimally.
How can I improve the COP of my heat pump?
Good maintenance and regulation of indoor temperature, as well as the use of timers, can significantly improve the COP of your system.
What are the best heat pump manufacturers?
Recognized brands such as Daikin, Mitsubishi Electric, Toshiba, and Fujitsu offer high-performance models with competitive coefficients.