A common concern among homeowners considering air source heat pumps is their performance during cold weather. As trusted heating engineers in Norfolk and Norwich, we're here to address this question in this blog.
How do heat pumps work in cold temperatures?
Heat pumps can extract warmth from air as cold as -25°C. This is possible because warmth exists in all air above absolute zero (-273.15°C), created by moving atoms and molecules. The system absorbs this heat through an outdoor unit and transfers it indoors via a refrigerant system. This process continues efficiently even in freezing conditions, ensuring your home remains warm throughout winter.
Are heat pumps less efficient when it's cold?
Heat pump efficiency is measured by Coefficient of Performance (CoP). At 15°C, a typical system achieves a CoP of 4.3, meaning it's 430% efficient. As temperatures drop, this efficiency gradually decreases, yet remains impressive.
At 7°C, the CoP typically measures 3.7, reducing to 3.1 at 2°C. Even in sub-zero temperatures of -7°C, systems maintain a CoP of 2.5, and at -12°C, they still achieve 2.3. This means that even in very cold conditions, heat pumps remain more than twice as efficient as traditional boilers.
What is the best weather for a heat pump?
While heat pumps operate most efficiently in moderate temperatures, they're designed to perform effectively year-round. In Norfolk's climate, these systems maintain excellent efficiency levels throughout all seasons. The consistent performance across varying temperatures makes them an ideal heating solution for our regional weather patterns.
Can your heat pump freeze in winter?
Modern heat pumps include automatic defrost cycles to prevent ice build-up. However, certain conditions may lead to freezing concerns. The key is maintaining proper airflow around the external unit and ensuring regular system maintenance. Our installation process includes strategic positioning of units and comprehensive guidance on winter operation.
How do I know if there's a problem with my heat pump in winter?
Several indicators suggest your heat pump requires attention. Watch for persistent ice accumulation on the outdoor unit beyond normal defrost cycles. A noticeable decrease in heat output or difficulty maintaining comfortable temperatures should be addressed promptly. Significant increases in energy consumption beyond normal winter usage patterns may indicate system inefficiencies requiring professional assessment.
Want to know more?
Our heating engineers in Norwich and Norfolk are here to help every step of the way, simply get in touch by calling us on 07824 393403 or 07939 979217 and we'll be happy to help.
