Hello all, I have been in my house for 8 years and have always had issues with the cost of heating. The first 3 winter months cost me almost $3000 until I figured out what was happening. From that point, I more or less shut down the electric backup heat. This controlled the costs. I installed a pellet stove to supplement the base heat. A few weeks ago, the coil ruptured in the geotherm unit. I refused to replace it without getting to the bottom of why the heat was unable to keep up without using the electric backup heat so much. I pulled the original permit and found there are two 320 foot loops. From what I am reading these loops are sized for 4 tons. My service company is telling me that my system is a 5 ton unit. Could this discrepancy be the reason why my electric heat is coming on so much? I am assuming it is because I had everything else checked out on the machine (by multiple service companies and the manufacturer) to make sure it was running to spec. The real question is what do I do? I really don't want to put good money after bad. I am looking at 3 real options: 1) Add another 320 foot loop and fix the coil. This should provide the existing geotherm enough flow to correct the heating problem. I am not sure that this is the only problem and I am not sure how much life I am going to get out of the existing unit. The house is only 10 years old, but I have no way to know if running the system with too little flow for so long has caused damage elsewhere. 2) I priced out adding another 320 foot loop and another 5 ton system and was shocked by the price (> $30,000). To be fair, this also involved changing the returns a little bit since the prospective installer thinks my unit is starving for air. The basement was finished by the original owners after the house was built and a return was never added. 3) Go away from geotherm completely. I am very reluctant to do this since geotherm was one of the attractions to buying the house and I am convinced that I have 85% of a working geotherm system. I just want to finish the last 15%. Please help.