Annual maintenance on a 2018 Daikin 80% single stage furnace. The technician (Ryan) cleaned the flame sensor, checked the capacitor, monitored all amp draws, checked the temperature differential, adjusted the gas pressure, changed the (1) 14x24x1 return air filter, and checked the static pressure. The system is in great shape with no rust or heat stress on the heat exchanger and the hot surface igniter is good at this time. The gas pressure was a little high so it was adjust down for optimal performance and longevity of the heat exchanger. Surge protection was suggested to protect the furnace and a duct cleaning as the duct work is pretty dirty. The customer will review the estimates.