Air Conditioning - A what-if question for the pros

Say I owned one of those old concrete block/slab homes in Florida built in the 50's, around 1200 sq ft. In the summer it get's down to maybe 79 or 80 at best. What if I came to you and said I want a central AC system that gets the place down to the high 60's in the heat of the summer. And not just standing in front of the ac duct, but actually maintaining the temp throughout the house. Money is not an issue, here are the keys, see you in a few weeks.

Even if you had to replace all the ac hardware, insulate the attic, tear down walls and insulate them, whatever. Could this goal of high 60's be achieved?

With all the right factors in place such as insulation, windows, etc. as you stated. Plus a properly sized system with a good duct system its doable.

Just guessing but instead of air transfer maybe a buried heat exchanger or one at the bottom of an artificial lake? Can't think of the proper name.

I could make in the 50's if you wanted.

I could make in the 50's if you wanted

With A/C or refrigeration?

It could be done easily with a Liebert unit like we use in server rooms. In order to get the place that cool it will be oversized and standard residential unit will not be able to de-humidify properly. The Liebert will be able to accomplish these needs easily. Hope you have a big pocket book.

Just guessing but instead of air transfer maybe a buried heat exchanger or one at the bottom of an artificial lake? Can't think of the proper name.

geothermal? ...........................

I think ground-source or groundwater-source heat pump is the common term....but I think it does fall under the geothermal category.