I've looked at Don Stephens' Annualized Geo-Solar approach and it seems to be fairly brilliant. There's even been a moderately similar approach done close by (Drake Landing in Okotoks, AB) - but it's not the same. Does anyone have any experience with this approach? (His website is greenershelter.org if you're curious)

What is geo-solar?

I have a geo-solar hybrid system. I use the hot water from the solar panels to heat the geo thermal fluid ground loop when the temperature of the solar fluid is not hot enough to heat the DHW. It is a great idea and works quite well.