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I priced a geothermal system for my homble abode and it would come to $65,000 for the equipment and was told beause the soil I have in my yard is mostly clay, it would not work well. Silt is easer to dig and would have a better heat transfer, but would make for many cracks in the basement foundation. I guess tankless water heater would be better. I heard of people saving 25% on shutting off their oil burner at differnt times of the day. Solar insentives are pittiful and some deals will be sun-setting soon, in my area. Big bucks and the payback is 11 years off. Bio-D for oil burner seems to be the only semi safe thing to lower fuel costs for home and diesel car.
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