Air-Source vs. Ground-Source Heat Pumps: Which One Is Right for You?

Heat pumps are becoming an increasingly popular choice for Australian homeowners looking for efficient and eco-friendly heating and hot water solutions.

Among the different types of heat pumps, air-source and ground-source systems are the two main options—but which one is best for your home when it comes to air-source vs ground-source heat pumps?

At G Store, we specialise in air-source heat pumps and can help you decide which system suits your needs.

To understand how heat pumps work and what system might suit your household, visit our guide on how heat pump hot water systems work.

How Air-Source vs Ground-Source Heat Pumps Work

Both types of heat pumps operate by transferring heat rather than generating it—making them more energy-efficient than traditional electric or gas heating systems. The main difference lies in where they extract that heat.

• Air-Source Heat Pumps pull heat from the outside air—even in cold conditions—and use it to heat water or your home. They’re compact, easy to install, and highly efficient in temperate climates like Melbourne.
• Ground-Source Heat Pumps, also known as geothermal systems, use underground pipes to absorb heat from the earth. Because ground temperatures remain stable year-round, these systems can deliver reliable heating performance regardless of outdoor conditions.

While both are considered among the best heat pumps for home heating, their installation and usage differ significantly.

Pros of Air-Source Heat Pumps

Air-source heat pumps are the most commonly used systems in residential settings—and for good reason.

Here are some of the standout air-source heat pump benefits:

• Lower installation costs: Air-source systems are significantly cheaper to install than ground-source alternatives, making them more accessible for most households.
• Quicker, simpler installation: There’s no need for extensive land excavation or underground piping, so installation is faster and less invasive.
• Ideal for Melbourne’s climate: Air-source heat pumps perform well in mild to moderate climates, like those found across Victoria.
• Compact and space-saving: Units can be mounted outside and don’t require large amounts of space.
• Dual-purpose systems: Some air-source units offer both heating and cooling, working seamlessly with hydronic heating and cooling systems.

At G Store, we stock a wide range of heat pumps, including leading brands like Reclaim and Sanden—ideal for homeowners looking for efficient, low-maintenance hot water systems.

Cons of Air-Source Heat Pumps

While air-source systems are versatile, there are a few limitations to consider:

• Slightly less efficient in extreme cold: Their performance can drop slightly in very low temperatures. However, this is rarely an issue in Melbourne’s temperate climate.
• Outdoor placement required: The unit must be placed outside with good airflow, which may not suit all property layouts.

Despite these minor drawbacks, air-source systems remain the preferred option for most Australian homes, thanks to their balance of performance and affordability.

Pros of Ground-Source Heat Pumps

Ground-source heat pumps also have their strengths, especially for larger properties or those seeking long-term energy savings.

• Extremely efficient: Because they draw heat from stable underground temperatures, they can offer very high performance regardless of weather.
• Quiet operation: With most components installed underground or inside, ground-source systems tend to run more quietly than their air-source counterparts.
• Low long-term operating costs: Over many years, homeowners may see energy savings that balance out the initial installation expense.

Cons of Ground-Source Heat Pumps

Despite their efficiency, ground-source systems come with some significant limitations:

• High upfront cost: These systems are expensive to install due to excavation and piping requirements.
• Longer installation time: The process involves site assessment, digging, and specialist installation teams, which can add time and complexity.
• Space requirements: You’ll need a fair amount of land to accommodate the underground loops—something not all residential properties can offer.

Because of these factors, ground-source heat pumps are often more suitable for large properties or rural homes with ample space and long-term energy-saving goals.

Air-Source vs Ground Source Heat Pumps: Which System Is Best for You?

When comparing air-source vs ground-source heat pumps, air-source systems are often the more practical and popular choice—particularly in places like Melbourne and regional Victoria. They’re cost-effective, easy to install, and offer excellent performance for both hot water and home heating in our climate.

At G Store, we recommend air-source heat pumps for most households. Whether you’re looking to upgrade your hot water system, replace an old gas heater, or install an energy-efficient hydronic system, we’ll help you find the right solution.

Not sure what size tank or system you need? Check out our guide on what tank size you need for your hot water system or contact our team for expert advice.