---
title: "Ground Source Heat Pumps vs Air Source Heat Pumps: Which is Ideal for Your Home?"
date: 2024-12-20T15:26:00+11:00
author: Geoff Pennington
canonical_url: "https://sogeo.com.au/blog/ground-source-heat-pumps-vs-air-source-heat-pumps-which-is-ideal-for-your-home"
section: Pages
---
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# Ground Source Heat Pumps vs Air Source Heat Pumps: Which is Ideal for Your Home?
When it comes to choosing energy-efficient heating and cooling systems for your home today, two solutions come to mind:
- **Ground-source heat pumps** (GSHPs)
- **Air-source heat pumps** (ASHPs)
When it comes to choosing energy-efficient [**heating and cooling systems**](%7Bentry%3A1@1%3Aurl%7C%7C%7D) for your home today, two solutions come to mind:
- Ground-source heat pumps (GSHPs)
- [**Air-source heat pumps**](https://sogeo.com.au/air-source-heat-pumps) (ASHPs)
Both systems are worth considering today because they can utilize renewable energy for heating and cooling. You can always rely on them to lower your carbon footprint. To choose between these two systems, you need to factor in the following:
- Climate
- Efficiency & Performance
- Property size
- Your budget
As you read on, you’ll discover exactly how to make the right choice between GSHP and ASHP systems for your home.
## Understanding how heat pumps work
Heat pumps work by extracting heat from outdoor air or the ground. After extraction, heat is further transferred into your home.
During the colder months, **ground source heat pumps** work by absorbing heat from the ground. The heat is further distributed into the indoor space through **underfloor heating** or **hydronic radiators** or fan coils for cooling. **Air source heat pumps**, on the other hand, work by extracting heat from the air and transferring it into your home using the same process. In the warmer months, however, the whole process is reversed for both systems.
## Understanding the difference between GSHPs and ASHPs
The major difference between **ground-source heat pumps** and **air-source heat pumps** lies in their heat source. Ground source systems work by extracting heat from the ground’s stable temperature. Air source systems, on the other hand, draw heat from the outdoor air.
- GSHPs use underground pipes to extract heat from the earth’s ground. The good thing here is that underground temperatures often remain relatively stable year-round. This explains why GSHP systems are reliable for consistent and efficient heating.
- ASHPs extract heat from the outside air regardless of the temperatures. They’re typically placed outdoors for easy extraction of heat. **Air source heat pumps also provide hydronic heating and cooling** solutions just like **ground source heat pumps**. This is possible when the extracted heat passes through a water-based system before being circulated through **hydronic radiators**, **hydronic cooling** fan coils or **hydronic underfloor heating** system.
## GSHPs vs ASHPs: Efficiency & Performance
For **ground source heat pumps**
- Efficiency: GSHPs are highly efficient. You can expect a Coefficient of Performance (COP) of 6-7. This means for every unit of electricity consumed, these systems produce 6-7 heat units when installed correctly.
- Performance: The ground temperature is known to be constant. As such, GSHPs deliver reliable performance regardless of ambient weather conditions.
- Lifespan: With proper maintenance, you can expect your GSHP systems to last 50> years. However, the heat pump itself only lasts up to 20-25 years.
- Noise: GSHPs are very quiet, they are also located indoors in a dedicated plant room which further reduces their noise signature, this makes them an excellent choice for strict boundary noise requirements or architectural homes with requirements to hide all plant equipment.
For **air source heat pumps**
- Efficiency: ASHPs are not as efficient as GSHPs. You can expect them to deliver a typical COP of 4-5. This value may even decrease during extremely cold or hot weather.
- In terms of performance, **air-source heat pumps** tend to perform best in milder climates. Their performance is never consistent during colder months.
- Lifespan: ASHPs’ lifespan falls between 10 to 15 years.
- Noise: ASHP’s are louder than GSHP’s, especially with lower tier brands, SóGeo can help recommend the right ASHP’s to suit your needs.
## How does heat pump performance change in a Melbourne summer?
The COP and efficiency figures most heat pump comparisons quote are based on mild conditions, around 20 to 25°C ambient. Melbourne summers do not stay there. On the days the air conditioner runs hardest, the conditions are exactly where air source and ground source heat pumps behave differently.
### Air source heat pumps lose efficiency in the heat
Air source heat pumps reject heat to the outdoor air during cooling and absorb heat from the outdoor air during heating. Both modes depend on a temperature differential between the air and the refrigerant cycle. As outdoor air gets hotter in summer, that differential collapses, the compressor works harder, and the coefficient of performance drops. A typical air source heat pump rated at COP 3.5 at 25°C drops to COP 2 to 2.5 at 35°C, and below 2 at 40°C. These are the days the system runs at full capacity, exactly when peak electrical demand is at its highest.
### Ground source heat pumps are weather-immune
A ground source heat pump rejects heat to and absorbs heat from the ground, which holds a stable 16 to 18°C across every Melbourne season. The temperature differential and the compressor workload do not change with the weather. A SóGeo geothermal install runs at a coefficient of performance of 4 to 7 in January and in July at the same electrical draw.
### Peak electrical draw at a 50 kW thermal load
For a Melbourne home with around 50 kW of total thermal load, the difference shows up clearly on a hot summer day. An air source combination at degraded summer COP 2.5 draws around 20 kW peak electrical. A ground source system at COP 5 draws around 10 kW. The difference is 10 kW saved at peak, and on larger luxury homes the saving scales further. For the full picture, see our [guide to reducing connected load with geothermal heat pumps](https://sogeo.com.au/blog/geothermal-heat-pumps-in-melbourne-sydney-reduce-connected-load-and-save-on-electrical-upgrades).
### Heat recovery, a capability air source cannot match
The hydronic loop that makes a ground source heat pump efficient also makes heat recovery possible. When the system cools the home in summer, the heat extracted from the indoor loop can be diverted to other thermal loads on the property. The pool heats. The spa heats. The hot water heats. All of it at no additional electricity cost, as a by-product of cooling the home. Air source heat pumps reject this heat to the outdoor air and waste it, because there is no fluid path between an air condenser and a pool loop. For a typical Melbourne luxury home with a pool, the saving on pool heating alone is in the range of $2,000 to $6,000 per year.
## GSHPs vs ASHPs: installation & costs
For **ground source heat pumps**
- In terms of installation, GSHP involves significant groundwork. Some of them include digging trenches and drilling boreholes. This makes the installation process complex and time-consuming.
- Due to excavation and loop pipe installation, it costs more to set up **ground source heat pumps**. The operating costs, however, are lower. This is simply due to the system’s high efficiency.
For **air source heat pumps**
- ASHPs are a lot easier and simpler to install than GSHPs. The entire setup should be completed within two to three days.
- Furthermore, ASHPs are more affordable to set up. The only issue, however, is that their operating costs are slightly higher. This is due to the reduced efficiency of ASHPs during colder cold winter days or extremely hot weather when cooling.
## Which heat pump is ideal for your home?
The choice of the right heat pump for your home depends on many factors, such as your budget, space, and performance needs.
- You should opt for GSHP systems if you have enough budget and space, and if you also need to lower your power consumption. You can rely on this system for consistent performance regardless of the climate.
- Air source heat pumps are recommended if you’re on a tight budget. You should also consider these systems if you lack enough space for ground installation.
Speak with experts at SóGeo today to get started with the setup of your [**heating and cooling system**](https://sogeo.com.au/air-source-heat-pumps).
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![SoGeo Team At Work]()
Choosing between ground source and air source comes down to your project goals. SóGeo designs and installs both, and the right answer depends on site, climate, and load profile.
Every install starts the same way: a site visit and a heat-loss calculation. From there we walk through the options on your specific home and write a fixed quote against the design. No estimates, no surprises, no pressure.
For a full overview of SóGeo’s hydronic and geothermal service in Melbourne, see our pillar page on [hydronic heating Melbourne](https://sogeo.com.au/hydronic-heating-cooling). For installation pricing detail, see our [cost guide](https://sogeo.com.au/blog/how-much-does-it-cost-to-switch-from-gas-to-hydronic-heat-pumps). For the substation-avoidance angle on luxury homes, see our [guide to reducing connected load with geothermal heat pumps](https://sogeo.com.au/blog/geothermal-heat-pumps-in-melbourne-sydney-reduce-connected-load-and-save-on-electrical-upgrades).
[Get a fixed quote from SóGeo.](https://sogeo.com.au/contact-us)
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