What is the main advantage of a geothermal heat pump over an air-source heat pump?

Geothermal heat pumps are known for their greater efficiency and stable performance, primarily due to the fact that they utilize the relatively constant temperature of the earth beneath the surface as a heat exchange medium. Unlike air-source heat pumps, which rely on outdoor air temperature that can fluctuate significantly with the seasons, geothermal systems tap into the ground, where temperatures remain more stable year-round. This allows geothermal heat pumps to operate more efficiently, translating into lower energy bills and a reduced environmental impact over time.

Additionally, the consistent temperatures underground ensure that geothermal systems can maintain heating and cooling performance more effectively across various weather conditions compared to air-source systems, making them a reliable choice for homeowners. This inherent stability and efficiency are key reasons why they are often viewed as superior to air-source heat pumps in terms of long-term performance and energy savings.