Your guide to air source heat pumps and cold weather
As the winter sets in, you might be wondering whether your air source heat pump (ASHP) will work during the colder months.
The good news is that they are designed to provide warmth even if the air temperature outside drops, ensuring your home stays comfortable. Let's look a bit closer at how an air source heat pump delivers winter warmth, while at the same time, providing an efficient heating solution.
How does an air source heat pump work in cold weather?
An ASHP captures warmth from the ambient outside air and transfers it indoors. You can think of this process as being like the one that keeps your fridge cool, but in reverse. But you might be thinking, “What if it’s freezing outside? Will the system still provide warmth?”
The short answer is yes – in the same way that your fridge stays cool even when it’s hot outside.
In fact, air source heat pumps can work well in temperatures as low as minus 25 degrees in some cases, although it’s unlikely that we will experience such temperatures here in the UK. The same process that is used during the rest of the year applies in the winter.
The refrigerant inside the pump absorbs the warmth in the air and is compressed via a compressor. This raises its temperature significantly and rapidly, with the generated heat transferred throughout your home’s heating system, keeping you comfortable, no matter what the weather is outside.
How an air source heat pump’s defrost cycle works
In freezing temperatures, an ASHP’s defrost cycle is vital for maintaining efficiency. This cycle prevents ice from building up on the outdoor unit, allowing the heat pump to function smoothly in cold weather.
Automatic temperature sensors within the air source heat pump detect when there is a buildup of ice or when the temperature drops to a certain level. When this happens, the system automatically enters the defrost cycle.
During a defrost cycle, your heat pump effectively goes into reverse temporarily. Rather than absorbing heat from outside, warm refrigerant from inside is used to clear ice that may be present on the outdoor unit. Don’t worry, the cycle usually only lasts a few minutes and you’ll likely not even realise it’s started.
That said, you may notice white steam from your heat pump while it’s in a defrost cycle. This is perfectly normal and is actually an indication that your heat pump is doing what it needs to do.
Winter care: preparing your heat pump for cold weather
In a similar way to keeping your car working effectively, proper winter care is essential for ensuring your air source heat pump runs efficiently when you need it to. Start by clearing any debris or snow from the outdoor unit. This will prevent blockages that can hinder performance later on. You should also get a qualified installer to service your heating system annually to ensure it is working properly.
Regular maintenance throughout the rest of the year is another crucial aspect of keeping your system efficient. Schedule a professional service before the colder weather arrives so that potential issues are identified before they become significant problems. This ensures your heat pump runs reliably even in freezing temperatures, when you’ll have a greater need for it.
Identifying and solving common cold weather issues
Your heat pump is designed to provide consistent comfort throughout all times of the year. If you notice anything different about the way it’s working, there are some steps you can try. Start by carrying out the basic checks like checking it is clear of snow and debris like we mentioned in the last section. If problems persist, it's wise to consult a professional.
Our Baxi-approved installers are ready to help, providing expert advice and solutions to keep your home warm and your system running efficiently, no matter how cold the weather gets.
Why choose Baxi for your heating needs
Here at Baxi, we offer a range of air source heat pumps designed to deliver reliable heating solutions year-round, including during winter. Our systems are built to perform efficiently in all weather conditions, ensuring your home remains warm and comfortable without excessive energy use.
With a commitment to quality customer service and a dedicated team of highly skilled installers, you can be sure that your air source heat pump system is ready for whatever the UK winter brings.
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