Tony Sivori wrote:
trader4 wrote:
The best choice in your case sounds like it would be a heat pump system,
either air or geothermal based.

No way geothermal is practical here. In fact, one of the big buildings
downtown (the Humana corporate headquarters, if memory serves) uses
geothermal cooling. They pump up cool aquifer water, and use it the same
as chilled water air conditioning from a traditional cooling tower. Then
the warm water goes back to the aquifer.

Geothermal "heat pump system". In the middle of winter you can use 20 degree
air as a heat source to warm the cooling coils or you can use 40 degree water.
The water is 20 degrees warmer to start with and a much better thermal conductor.
Which do you think is more efficient?