I am building a 6800 sq ft ICF home with basement in tennessee. I cannot decide what product to go with for heat at air. I am looking at Geothermal but i ran across a product call NTI Matrix. Home heating, hot water, and ventilation system all in one package. Can anyone help me that knows about this product or has this product? this does not answer my question about AC if I go with this , so any suggestions would be welcome. thanks leigh