I'm not used to think of ground source systems as simply heat pumps... I think of them as geothermal systems. Maybe because the installation is lot more involv

I'm not used to think of ground source systems as simply heat pumps... I think of them as geothermal systems. Maybe because the installation is lot more involved. But in places like Florida, if you have a 15+ year old A/C, replacing it with a conventional modern heat pump, it would probably pay for itself in a few years.