The homeowner was concerned about their geothermal system's performance, stating it was running much more than usual and their recent energy bills were unusually high. I connected diagnostic gauges to the ground loop and found the system pressure was well below the optimal range, forcing the unit to work harder. After confirming there were no leaks, I used a flush cart to purge, recharge, and pressurize the loop with the correct fluid mixture, restoring it to peak efficiency. The customer was relieved that the main unit was in good health and is looking forward to seeing their energy bills return to normal.