How Much Electricity Does An Air Source Heat Pump Use?

Last Updated on June 12, 2025

Air source heat pumps (ASHPs) are gaining popularity across the UK as an efficient, low-carbon alternative to traditional heating systems. 

But many homeowners, landlords, and commercial property owners want to know one thing before they invest: how much electricity does an air source heat pump use? 

In this blog, we’ll explore the energy consumption of air source heat pumps based on their size, property type, insulation levels, and more.

What Is the Average Electricity Usage of an Air Source Heat Pump? 

On average, a typical UK home may see electricity usage ranging from 2,500 to 5,000 kWh annually for heating when using an ASHP.

However, actual usage can vary significantly depending on several factors, including the size of the system, how well-insulated your home is, and the outside temperature

A major advantage of ASHPs is their coefficient of performance (COP). A well-installed unit often delivers 3 to 4 units of heat for every 1 unit of electricity consumed. 

This high efficiency reduces running costs and energy consumption, especially when paired with a well-insulated property.

Factors That Impact Heat Pump Electricity Usage

Several variables influence your heat pump’s energy use:

• Property size and layout – Larger homes require more energy to heat.
• External temperatures – Colder climates can reduce ASHP efficiency.
• System size and efficiency – Choosing the right-sized air source heat pump is vital. 
• Heating demand – High usage of hot water and heating throughout the day increases consumption.
• Radiator compatibility – If you’re wondering whether your existing radiators will work efficiently with a heat pump, the good news is that many systems can be adapted.

Air Source Heat Pump Electricity Usage by Size

Below is a table outlining approximate electricity usage for different sizes of air source heat pumps. These figures assume a reasonably well-insulated property and a seasonal performance factor (SPF) of 3.2.

How Insulation Affects Air Source Heat Pump Electricity Use

One of the most critical factors in determining how much electricity your ASHP will use is insulation. Well-insulated homes retain heat more effectively, reducing the workload on your heat pump.

If your home has poor insulation, your ASHP will have to run for longer periods and at higher power outputs to maintain comfortable indoor temperatures. This will increase your electricity usage and energy bills. 

Older homes, in particular, might require additional energy efficiency upgrades to get the best results. Read our guide on how air source heat pumps work in old houses for more insights. 

Here are a few upgrades to consider before or alongside your installation:

• Loft insulation (270mm recommended)
  
• Cavity or solid wall insulation
  
• Double or triple glazing
  
• Draught-proofing windows and doors
  
• Underfloor insulation (especially in older homes)

If you’re unsure about your current setup, our guide on “is my house suitable for a heat pump” will help you decide if your property is a good match for this type of system.

Real-World Running Costs and Energy Bills

According to Ofgem’s energy price cap for July to September 2025, the average electricity unit price in the UK is 25.73p per kWh. If your air source heat pump uses 4,000 kWh per year, that translates to approximately £1,029 annually. 

However, this cost can be significantly reduced through proper insulation, the use of smart thermostats, and optimising your system’s operation.

Check out our guide on heat pump running costs for more details.

Heat Pumps vs Traditional Heating: Electricity Consumption Comparison

Unlike gas boilers, which burn fossil fuels, air source heat pumps draw heat from the air and only use electricity to power the unit. This leads to reduced carbon emissions and lower long-term running costs.

Additionally, pairing an ASHP with solar panels can drastically reduce or eliminate electricity costs altogether. 

If you’re still not convinced, our article on whether heat pumps are worth it will help you make an informed decision.

Why Picking a Top Heat Pump Brand Matters for Electricity Use

Not all air source heat pumps use electricity equally. Leading brands like Mitsubishi Electric, Daikin, and Vaillant are recognised for their high efficiency and advanced technology. Choosing one of these brands can reduce electricity consumption while maintaining optimal heating performance. 

Equally important is working with an experienced installer who ensures your heat pump is correctly sized and configured for your property’s needs. Check out our air source heat pump installation guide so you know what to expect from an installer..

Do Air Source Heat Pumps Use More Electricity in Winter?

Not at all. Modern air source heat pumps are engineered to maintain efficiency even when temperatures drop below freezing, meaning they won’t drastically increase your electricity consumption during the British winter.

Our guide, do heat pumps work in cold weather, provides a clearer understanding of how these systems operate in colder conditions.

Request a Free Quote for an Air Source Heat Pump Today

If you’re ready to lower your heating bills, reduce your carbon footprint, and futureproof your home, now’s the time to take action. At Eco Happy, we make it easy to switch to renewable heating. Whether you’re a homeowner or landlord, we’ll help you find the right solution tailored to your property.

Request your free, no-obligation air source heat pump quote today.

Make the switch to smart, sustainable heating with Eco Happy – your trusted heat pump specialists in the UK.