Fagone Plumbing, Heating & HVAC performed a routine annual maintenance service on a residential mini-split air conditioning system in Nahant. The inspection confirmed the system was operating efficiently with no mechanical concerns. The indoor unit and outdoor condenser were cleaned, tested, and verified to operate properly. An important finding during service was confirmation that the system utilizes R454 refrigerant rather than R410A, requiring future maintenance records and service procedures to reflect the correct refrigerant type.