If you are on oil, the average consumption per household is about 1,000 gallons/year in the northeast of you are on heating oil. If you are driving a 20 gpm car for 12000 miles a year, you are using about 600 gallons. The rule of thumb is that each geo system is the equivalent of taking 2 cars off the road compared to heating oil. Not really insignificant. I get it that you are only interested in $$$. Everyone obviously has its own priorities. So what is the deal here. Stick with oil until the middle east decides to tighten the screws, and shoots up the oil price again. Then be concerned about your money. Get a geo system then. The question is whether you are proactive or reactive. Your call. I just don't get your point of your discussion here.