Trane heat pump with air handler installed in 2011. All electrical connections are tight with no corrosion. X13 blower motor is acceptable. Blower wheel and evaporator coil are clean. Dual run capacitor is within tolerance. Compressor and condenser fan motor are acceptable. Refrigerant levels are in range. Highly suggest adding a compressor saver to help with the efficiency and longevity of the the system.