Heat Pumps May, 2025

Air Source vs Ground Source Heat Pumps

There are several factors to take into consideration when deciding between air source vs ground source heat pumps. Every home is different, and with the growing demand for energy-efficient solutions, it’s important to choose a heating system that helps keep your home at a comfortable temperature no matter the time of year. Air source heat pumps and ground source heat pumps are two options for regulating temperature, but which works best? Let’s explore further advantages and drawbacks of these heating solutions to discover which is ideal for your property.

Table of contents:

Comparison of Heat Pump Types

While both provide an efficient way to maintain a pleasant indoor temperature, there are a few key differences between air source and ground source heat pumps, specifically, how they operate and the installation process.

An air source heat pump works by extracting heat from the outside air to heat a building. It can work even in cold weather, as it uses a liquid refrigerant to help absorb heat. The unit doesn’t require much space, which makes for a straightforward installation.

A ground source heat pump also offers reliable warmth and cooling. It extracts heat from the soil, and transfers it into your home. It’s important to understand that ground source heat pumps might require planning permission, as the installation process involves burying a network of pipes in your garden. Both heating systems can help maintain an optimal temperature, but a ground source heat pump might not be practical if you have limited garden space.

Efficiency of Heat Pumps

The most notable similarity between air source and ground source heat pumps comes down to their efficiency. Both can deliver comfort without the high running costs. They’re versatile enough to heat homes in the winter and cool homes in the summer.

One of the main reasons air source heat pumps are so efficient has to do with how they work. This cycle involves drawing air from the outside, that air is then passed through a heat exchange surface and is then sent into your home through your home’s central heating system. This cycle doesn’t require a lot of electricity, reducing your carbon footprint and energy bills in the process. The overall efficiency is often influenced by the outside temperature. However, air source heat pumps have been proven to work in any weather.

Ground source heat pumps require more preparation work, but once they’ve been installed, they efficiently absorb heat from the ground through their underground pipework. Since soil temperature is often warmer than the air, they can consistently provide a stable and reliable source of heat. However, they will require having sufficient space in your garden, and installations are often more complex.

Sustainability of Heat Pumps

These sustainable solutions can have several advantages over other methods, such as standard gas boilers. Both air source and ground source heat pumps can help reduce carbon emissions and dependence on fossil fuels.

While ground source heat pumps may seem like the more sustainable and efficient option, their installation process can be invasive. It requires digging trenches, which can have an environmental impact. Depending on the layout of your garden, you may need planning permission if you’re considering having one installed.

The process of installing an air source heat pump is straightforward and can be less intrusive. A unit can be conveniently installed nearly anywhere outside your home. While their efficiency can be influenced by outside temperatures, they’re still an eco-friendly option that can successfully control interior climate conditions. Both choices are sustainable and an investment towards greener solutions, but air source heat pumps may offer more accessible sustainability that won’t require disruption through your garden.

Product Lifespan

Maintenance influences the longevity of any heating system. On average, ground source heat pumps have a slightly longer product lifespan than air source heat pumps. However, with occasional maintenance, an air source heat pump can last over 20 years, which is the same amount of time as a ground source heat pump. Simple tasks such as clearing debris, cleaning filters and hiring a professional service to inspect refrigerant levels go a long way in extending the product’s lifespan.

Installation Requirements

This is the most notable difference between the two heating solutions. Ground source heat pumps require more space for installation, as the process might involve digging trenches or drilling boreholes. Trenches can be as deep as 2 metres, while boreholes involve installing pipes vertically and can be around 50 metres deep. In certain instances, this might require planning permissions, which can extend the installation process.

An air source heat pump installation requires little space. In contrast, no digging is required, as the compact unit conveniently sits outside your home and can be connected to your existing system. An industry professional can normally complete an installation in as little as two days with minimal disruption, making it a fast, easy and efficient way to upgrade your heating without the hassle of an intrusive installation.

Cost Comparison of Heat Pump Types

Air source heat pumps are usually a more cost-effective option compared to ground source heating systems. This is in part because they offer a straightforward installation process that’s quick and easy. The process of installing a ground source heat pump involves a lot of groundwork and preparation, making it more costly. Both solutions can lead to significant energy bill savings, but it’s important to consider installation costs to get a better sense of your overall savings.

There are government grant schemes available to assist with the costs of heat pumps. The boiler upgrade scheme can cover £7,500 off the costs of an air source heat pump. Properties in more rural locations may qualify for up to £9,000 instead. This scheme makes heat pumps even more affordable, in addition to the savings you can gain from having lower energy bills.

Advantages and Drawbacks of Heat Pump Types

Let’s further break down the key advantages and drawbacks of air source vs ground source heat pumps to help give you a clearer idea of which is right for you.

Air Source Heat Pumps

Advantages:

Easy and affordable installation process
Budget-friendly with low up-front costs
Operates efficiently regardless of the outside temperature
Sustainable solution that produces less carbon emissions
Provides long-term savings
Available government grants to assist with installation fees

Drawbacks:

Outdoor units will require occasional clearing of debris
May not be as efficient in freezing conditions, but can still be more efficient than boilers

Ground Source Heat Pumps

Advantages:

Energy-efficient heating solution
Environmentally friendly and can minimise greenhouse gas emissions
Available government incentives to reduce costs
Operates quietly, only producing a gentle hum

Drawbacks:

Intrusive and complex installation that requires significant digging
May require planning permissions as it takes up more space
Higher upfront costs compared to air source heat pumps

Considerations When Choosing a Heat Pump

The main aspects to consider when deciding on the best heat pump for your property will be space, budget and efficiency. For a ground source heat pump, you need to have a certain amount of outdoor space available. You may even need to rearrange your garden to accommodate installation. An air source heat pump will require little to no preparation on your behalf, as they don’t require much space for installation. The lower upfront costs of air source pumps also make them a convenient solution for providing your home with comfortable temperature control.

Both heating solutions operate similarly and can lower your energy bill, but if you’re limited by budget or space constraints, an air source heat pump is the ideal choice for your property.

Conclusion

To summarise, air source and ground source heat pumps are both excellent heating solutions that can perform efficiently year-round. The most significant difference is based on their installation process. Ground source heat pumps tend to be a larger-scale, more complex and expensive installation. In contrast, air source heat pumps are quicker and less complicated. Those in need of a budget-friendly, sustainable heating system might be more inclined to go with an air source heating system to provide reliable warmth and cooling.

Contact Rollings Renewables

Contact our expert team with any enquiries on air source heat pumps and discover how they can provide significant savings to your energy bill. We can even apply for any government grants on your behalf to simplify the process. Give us a call on 01905 621777 or send us an email at sales@rollingsrenewables.co.uk to discuss any questions on air source heat pumps or any of our renewable energy solutions.

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