I've heard it's a pretty good system,just might be a little expensive initially due to the extra well and heat exchangers. Some places have outlawed them because you do mess with the ground temperature and the watertable. I wish I had looked into the system more before replacing my boiler last year. I did cut my oil bill almost in half,but now with the price doubled what did I gain? I hear they can make vegetable oil for @$.66 a gallon,I'd love to figure out how to burn that instead. Even if it needs 5 times as much oil,I'd still be ahead at that price. Hank