Well, when the humidity isn't too high, I sometimes use my basement to cool the house. (the basement floor and first ~1-1/2 feet of wall is bedrock)But if you mean a geothermal loop, no, I can't say as I have, although I wish I was able to afford such a system.
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Depends on what you mean by "geothermal".In most places there isn't enough self-replenishing ground heat to do what's usually called geothermal.However, there *are* heat pump systems which shove extra heat undergound during summer (as part of your air conditioning system) and recover it during the winter for additional heating. Friends of mine are installing such a system now. You'd need to look carefully at how such systems behave in your particular climate and your particular ground formation, and figure out from that how many years it would take for the investment to pay back... then decide whether you're going to be in the house long enough for it to be worthwhile.
I have seen this done with Dick Strawbridge "It's not easy being green" - google him and you will see different ways of easily achieving your aims. here's some links to save you time: they are not bang-on to your query but a quick-ish search should find exactly what you're looking for as I saw Dick do this on his tv programme. http://www.reuk.co.uk/Its-Not-Easy-Being-Green-Series-2.htm http://www.reuk.co.uk/Solar-Greenhouse-Heat-Sink.htm http://www.dickstrawbridge.com/www.dickstrawbridge.com/Home.html You may find other projects to inspire you further! I know I did!
You can go vertical some times 10's of meters - it tends to be more costly but is more effective.Air source works in most places as well - although not as effective. >>>>there are some options to the right of the page >>>>>>>>I have looked at it BUT to be honest unless your house is a high spec insulated house + some it is going to looses heat faster than you can replace it.In Sweden they have built houses that are so well insulated that they need NO HEATING at all apart from the humans and cooking activity. In fact getting rid of excess heat is a bigger problem.In my old house which had very high 15 foot ceilings - One trick i found particularly effective was to build a plywood box floor to ceiling in the corner of the room - 2 Temp sensors compared the temp at top and bottom and turned on a PC box fan when the top was warmer than the bottom, this circulated warm air that normally heated the ceiling.The temp sensors were just a refinement it initially worked fine with just the fan on all the time.
I also want to build just that -- heat elevators - there's a several degree difference between a) the floor-to-ceiling distance on any given floor, and b) the floor of basement to ceiling of top of house temperature -- I made a rudimentary system that turns on the furnace fan to do the same, but it suffers where the cold-air-returns are located in the wrong part of the house.
My next door neighbour has a ground source heating system covering about 1/2 an acre. It provides 90% of the hear input to the house.Yards of pipe buried about a meter underground with a water glycol mix pumped through them to a heat exchanger.
I've wanted to do that a long time now -- but we have to dig a lot deeper here in Canada to get a safe distance from the frozen ground during the winter. During the summer we get plenty of sun which could be pumped back into the ground.