Forgot Option #2
If we are looking for effiecncy and do not want to invest the money into a geothermal system you can always go with a heat pump. A heat pump follows the same princple as geothermal, but instead of extracting heat from the earth, the heat pump extracts heat and cooling from the air. It actually looks just like a A/C condensor, just a little bigger. Look here to see if they can give you a good price for an Goodman or Amana, djsonline.com
Last edited by Square Eye; 04-29-2008 at 02:40 PM.