Arrived on site to perform fall tune up on a 4 year old unit. Unit located in laundry room closet. Client stated no issues. Cycled unit and was operational. Filter were dirty due to area they live at. Dirt is always going to be in home. Advised need to be replacing filter as needed to keep dirt out of unit. Blower motor is good and in range with slight oil but okay. Wheel is dirty from dirt that has entered unit. Secondary secondary motor control is in range and good. Good temperature rise and igniter was good. Drain lines were draining. No access. Advised no protection on unit and recommended adding surge protectors to unit to protect from electrical surges and power outages that can damage damage or even short out systems and components. Cycled unit and went over all findings and how unit is running. Client is aware was okay on recommendations and unit was operational upon departure. He would be ordering his own filter and replace when he dose.