There are two energy demands for geothermal heating. There is the water pump to bring groundwater to the surface and discharge it back to the groundwater that you mentioned. There is also a heat pump with compressor to remove heat from groundwater and transfer it to the swimming pool water. The heat pump is similar to what heats most of our homes in cooler weather. The difference is that the geothermal heat source is groundwater at temps of say 60F or so and not air which can be cooler in the winter months.
In addition the geothermal system requires underground piping which may not be practical for smaller homeowner lots. Large condo pools have more land available such under parking lots and ammenity areas that could accommodate geothermal systems.
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