I see where some of you figured a pay off for the geo thermal in 4 and 5 years and in my mind I try to figure out how it is figured? If in one case the cost totaled out at $17,500. If after the credits you had around $12,000 to spread out over 5 years this would figure out to saving over $2000 per year. I would assume by this the propane cost was extremely high. The convenience of the geo thermal would be extremly nice. I am trying to convert everything over to my Heat pump situation. I know that during cold weather I would be having electic heat as the heat pump could not convert the cold air to heat. Now if my total heating and cooling was about $1800 per year and this is about $150 per month. Could you with geo thermal give me some figures on how much I could realize in geo thermal savings---please.