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Writer's pictureGreenwave Renewables

Air Source Heat Pumps vs. Ground Source Heat Pumps: Which Is Better for Your Home?

Updated: Aug 27

As the demand for renewable energy solutions grows, homeowners are increasingly considering heat pumps for their heating and cooling needs. Two popular options are air source heat pumps (ASHPs) and ground source heat pumps (GSHPs). Both offer significant benefits over traditional heating systems, such as reduced carbon emissions and lower running costs. However, they operate differently and come with different costs and installation requirements. This blog post will explore the key differences between air source and ground source heat pumps, highlighting why air source heat pumps have become a more favorable option due to their improved efficiency and lower installation costs.




air source vs ground source heat pump



Understanding Air Source Heat Pumps and Ground Source Heat Pumps


Air Source Heat Pumps (ASHPs) extract heat from the outside air and transfer it into your home. They can also work in reverse, extracting heat from inside the house and expelling it outside, making them effective for both heating and cooling. ASHPs consist of an outdoor unit that absorbs heat from the air and an indoor unit that distributes the heat into the home, typically through radiators, underfloor heating, or a hot water system.


Ground Source Heat Pumps (GSHPs), on the other hand, extract heat from the ground. They require a series of pipes, known as a ground loop, to be buried in the ground. These pipes circulate a mixture of water and antifreeze, which absorbs heat from the ground and transfers it to the heat pump. GSHPs are also capable of both heating and cooling and can be highly efficient due to the relatively stable temperature of the ground.


Efficiency: Air Source Heat Pumps Have Come a Long Way


In the past, ground source heat pumps were considered more efficient than air source heat pumps because the ground maintains a relatively constant temperature throughout the year, providing a reliable source of heat even in the depths of winter. ASHPs, on the other hand, had to contend with fluctuating air temperatures, which could reduce their efficiency, especially in colder climates.

However, advances in technology have dramatically improved the efficiency of air source heat pumps. Modern ASHPs now have significantly higher Coefficient of Performance (COP) ratings than their predecessors, often achieving COPs of 3.5 or higher. This means that for every unit of electricity used, they can produce 3.5 units of heat, making them incredibly efficient. Some high-performance models can even achieve COPs of 4.0 or above, rivaling the efficiency of ground source heat pumps.

The improvement in ASHP efficiency is largely due to advancements in compressor technology, better refrigerants, and improved design. For example, the use of R290 refrigerant, known for its excellent thermal properties and lower environmental impact, has contributed to higher efficiency and performance. These advancements mean that ASHPs can now provide reliable and efficient heating, even in colder weather, making them a viable option for homeowners in a wide range of climates.

Cost: A Major Advantage for Air Source Heat Pumps

One of the most significant differences between air source and ground source heat pumps is the cost of installation. Ground source heat pumps typically require a much larger upfront investment due to the extensive groundwork needed to lay the ground loops. Installing a GSHP can involve drilling boreholes or digging trenches, which requires specialized equipment and can be both time-consuming and costly. The total installation cost for a GSHP can range from £10,000 to £20,000 or more, depending on the size of the system and the complexity of the installation.

In contrast, air source heat pumps are much easier and less expensive to install. Since they don’t require ground loops, the installation process is simpler and quicker, reducing both labor and material costs. ASHP installation typically ranges from £6,000 to £12,000, making it a more affordable option for many homeowners. This significant cost difference makes air source heat pumps an attractive option, especially for those looking to upgrade to a more efficient heating system without the high upfront costs associated with ground source systems.


Performance in Different Conditions


Another consideration when choosing between air source and ground source heat pumps is how they perform in various conditions:

  • Cold Climates: Ground source heat pumps are traditionally favored in colder climates because they rely on the stable temperature of the ground. However, modern air source heat pumps have been designed to perform well even in sub-zero temperatures. High-quality ASHPs are equipped with defrosting features and can maintain efficiency even when the air temperature drops, making them suitable for colder regions.

  • Space Requirements: GSHPs require sufficient outdoor space for the installation of ground loops, which may not be practical for all properties, especially those with limited garden space. In contrast, ASHPs require only an outdoor unit, which can be installed in a variety of locations, making them more versatile for different property types, including urban homes with limited outdoor space.

  • Maintenance: Both systems require some level of maintenance, but ASHPs are generally easier to maintain due to their simpler installation. Routine checks on the outdoor unit, cleaning the filters, and ensuring the system is free from debris are usually sufficient to keep an ASHP running smoothly. GSHPs, with their extensive ground loop system, might require more complex and potentially costly maintenance if any issues arise with the buried pipes.


Environmental Impact


Both air source and ground source heat pumps offer substantial environmental benefits compared to fossil fuel-based heating systems. By using renewable energy sources (air or ground heat), they reduce greenhouse gas emissions and reliance on fossil fuels.

With the advancements in air source heat pump technology, ASHPs are now more environmentally friendly than ever. The use of eco-friendly refrigerants like R290 further reduces their environmental impact, making them a greener choice for sustainable home heating.


Why Air Source Heat Pumps Are a Favorable Choice Today


Given the significant improvements in air source heat pump technology, their cost-effectiveness, and their versatile application, ASHPs have become a highly favorable option for homeowners:

  • Improved Efficiency: Modern ASHPs have high COPs, making them efficient even in colder climates.

  • Lower Installation Costs: ASHPs are easier and cheaper to install than GSHPs, making them accessible to more homeowners.

  • Versatility: They can be installed in various property types, including those with limited outdoor space.

  • Environmental Benefits: ASHPs use renewable energy and have a lower carbon footprint, especially with the use of advanced, eco-friendly refrigerants.


Conclusion: Making the Right Choice for Your Home


Both air source and ground source heat pumps offer excellent benefits, but the choice between them will depend on your specific needs, property type, and budget. With the significant advancements in air source heat pump technology, they now provide a highly efficient, cost-effective, and environmentally friendly solution for home heating and cooling.

At Greenwave Renewables, we specialize in installing state-of-the-art air source heat pumps that offer exceptional performance and reliability. If you’re considering a heat pump for your home and want to explore your options, contact us today. Our team of experts is here to help you find the best solution for your heating and cooling needs, ensuring you enjoy a comfortable, energy-efficient home.





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