A homeowner’s Trane XR16 air conditioner in Rocky Hill was failing to cool properly. Upon inspection, I found a low refrigerant charge and traced the issue to a leaking evaporator coil. Using an electronic leak detector, I pinpointed the leak, recovered the remaining R-410A refrigerant, and replaced the damaged coil. I then performed a triple evacuation using a vacuum pump to remove moisture from the system before recharging it with factory-specified refrigerant levels. After verifying correct superheat and subcooling readings, I confirmed that the AC was cooling efficiently. The system is now fully operational, delivering optimal comfort to the home.