Do heat pumps work in winter?

Heat pumps are highly effective even in colder winter temperatures. Air source heat pumps used in residential heating systems are designed to operate efficiently at outdoor temperatures as low as -10°C, which is well below the typical winter temperatures experienced in most parts of the UK. In fact, heat pumps are widely used in countries across northern Europe, including Norway, where temperatures often drop much lower than this.

However, it’s important to keep in mind that outdoor temperatures can influence the energy efficiency of heat pumps. The system’s efficiency is measured using the Coefficient of Performance (COP), which indicates how much heat is produced for every unit of electricity consumed. On average, an air-to-water heat pump will produce around 4 units of heat for every 1 unit of electricity it uses, resulting in a COP of 4. This means that the system is highly efficient, as it provides several times more heat than the electricity it consumes.

In colder conditions, the COP may fall to 2.5, meaning the pump would produce 2.5 units of heat for each unit of electricity. While this is a reduction in efficiency, it still represents a significant improvement over traditional heating systems.

In comparison, gas boilers, which are commonly used for home heating, typically have a COP between 0.7 and 0.8, meaning they produce far less heat for each unit of energy they consume.

There are many factors to consider when assessing whether a heat pump is right for your home. We have a number of useful articles and resources to help you including our Homeowner’s Guide to Heat Pumps.