Split-system, air-source heat pumps include a unit inside the home and a unit outside the home. They generally cost less than geothermal systems, especially considering installation costs, but are typically not as energy efficient. Packaged air-source heat pumps are available as well with the entire system in one cabinet.
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In terms of efficiency, geothermal heat pumps are far superior to air-source models. This is because the temperature below ground is relatively stable as compared to the air temperature above ground. At this temperature, a heat pump operates at peak efficiency
Air–to-air heat pumps are commonly recommended in cooling-dominant climates because they are an up-front “cheaper” alternative, they don’t need to handle as much heating (at which geothermal also excels), and are generally more efficient than their traditional counterparts
Geothermal Vs. Traditional HVAC | Coldcraft Inc.
Pros And Cons of Geothermal Heat Pumps | EnergySage