There certainly has to be a lot of "slop" in the prices Absolutely. There is no possible way the same brand name unit and model # can cost thousands more in my area than in Ohio, upstate NY, and Penn - in one case ten thousand dollars more. It's definitely excessive mark up. Clearly, installers in those other places are making a profit or they wouldn't be doing those jobs. Bluecuda: "Cost does matter. Comfort matters. Efficiency matters. It all matters to me. I want to feel like I have a system that's going to work efficiently, keep my home and more importantly family comfortable and warm in the winter, and I don't want to spend $50k to do it. When I see bids $20k apart in price for the exact same setup, it leads me to believe that there is a LOT of slop in some of these bids." My sentiments entirely. I, too, will have a geo system. It will be expensive, far more than a fossil fuel one. I have always known that, but, I want to pay a fair price for it, not a King's ransom. While I do understand the need to make a reasonable profit, I resent gouging.