I'm in a subdivision but still gave geothermal a look when first planning. Was a few years ago but then seemed yes, energy costs are cheaper than conventional heating/cooling but I figured probably wouldn't be seeing the saving for about 15 years or more due to the up-front costs for boring and equipment.
Was around the same time I figured just go the HE furnace started looking into the geo-loop for the tank cooling. As the lot wasn't graded had lots of time to plan. Ran the tank the first summer and easily kept temperature in range just with muffins fans and now since central air see no reason for burying pipe in the backyard.
My comments for geo-loop on the tank are for a 145g with 2x250W lights. I could see it being a use for cooling a larger tank specially in the winter to prevent humidity or moisture problems, though a cheap bathroom fan in the fish room or a HRV unit would do lot's as well.
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