Air Source vs Ground Source Heat Pumps
Choosing between air source and ground source heat pumps can feel like a tough decision, so how do you know you're making the right choice? Taking time to understand the benefits and how they work is a key step towards upgrading your home's heating. This guide covers how heat pumps work, the differences between the two systems, and advice on choosing the right pump for you.
How Do Heat Pumps Work?
Heat pumps are a smart, energy-saving way to warm your home and an eco-friendly alternative to regular boilers. They work by moving heat from outside into your house, similar to how a refrigerator takes heat out, but in reverse. Depending on the type, they draw heat from the air or the ground, then compress it to make it hot enough for heating. They can be used for space heating, underfloor heating and even hot water, making them a flexible and environmentally friendly option.
Air Source vs Ground Source: The Difference
Air source heat pumps (ASHP) extract heat from the outside air even in cooler temperatures, are installed on an external wall, and are relatively quick and easy to set up, more affordable to install and suitable for a wide range of properties. Ground source heat pumps (GSHP) extract heat from underground pipes, making them more efficient than ASHPs thanks to stable ground temperatures, but they need more space and have higher initial excavation costs.
Comparing Efficiency, Noise and Lifespan
Air source pumps have slightly lower efficiency in colder climates, produce noise levels of around 40–60 decibels, and last 15–20 years with proper care. Ground source pumps deliver consistently high efficiency regardless of weather, run quieter at around 40–42 decibels, and last 20–25 years or more. Both cut carbon emissions compared to fossil fuels, with GSHPs offering even lower emissions due to their higher efficiency, while ASHPs need minimal outdoor space and GSHPs require significant land area for ground loops.
Which Should I Choose?
The right choice depends on your property and heating needs. Air source pumps are ideal for urban or smaller properties with limited outdoor space, and suit mild climates and well-insulated walls and roofs. Ground source pumps are a great choice for rural homes with ample outdoor space, and for a long-term investment in renewable heating they may offer greater savings due to their efficiency. Our experts at Liverpool Heating can help you assess your property and lifestyle to find the best fit.
Air Source Installation Costs (2025)
Typical supply-and-fit costs for an air source heat pump run from £12,400 up to £25,000, with most average-sized homes seeing costs around £14,000–£16,500. Upgrades to radiators, pipework or insulation may add several thousand pounds. Eligible homes can claim up to £7,500 via the government's Boiler Upgrade Scheme.
Ground Source Installation Costs (2025)
Ground source systems cost more due to groundwork, typically £16,200–£49,000, with a standard 3–4 bedroom home averaging £22,000–£34,000. Horizontal installation runs £16,200–£31,000 depending on house size and output, while vertical installation costs £23,000–£49,000 owing to deep borehole drilling. These systems are also eligible for up to £7,500 from the Boiler Upgrade Scheme.
