New customer 2019 Trane 4 ton Air Handler and Heat pump split system heating tune up. Asked about filter and how home is heating. It has been doing great, customer just looking to keep system maintained. Filter has about another month of life in it. Inspect air handler, breakers, blower, evaporator, float switch, drain and heat kit. Cycled system between heat, emergency heat and cooling modes. Checked compressor, reversing valve, defrost cycle, control boards, refrigerant pressures, capacitor and contactor. Checked heat strips, sequencers and amps. Measured delta t. System is operating well for the winter season. Spoke with customer about the benefits of our shield protection plans, and how they not only help save on repairs but also on getting add on items like UVC lamps and surge protectors installed on system to give it a more efficient life.