2021 3.5 ton Trane XR heatpump. Filters are replaced in a regular basis. Drain line is clear. Evaporator coil is clean. Blower wheel is clean - variable speed motor with high efficiency. Second stage electric heatstrips are within proper manufacture amp draw. All electrical components tightned. No signs of burns or scorched wires. Insulation is Antares grade. Fresh air intake is fully functional. Outdoor unit coils have been washed thoroughly. Capacitor is within manufacturer tolerance. Brushed off all components. Voltage is proper. Amp draw on compressor and fan motor is proper. Condenser fan motor is variable speed - high efficiency. Refrigerant levels are proper per manufacturer data tag. System is fully functional. Trane holds a 10 year functional parts warranty.