Technician arrived on site and started heating tune up. Cleaned off top of furnace. Cleaned off panels. Cleaned out inside of blower cabinet, however it heavily rusted. Blower wheel is also rusted out. Could possibly break due to corrosion. Checked recently installed components in furnace. They are good. All motors are okay. Safety switches are working as intended. Heat is operational. Heating components are wearing out. Hot surface igniter is showing signs of failing. Flame sensor is oxidized. Inducer motor is okay. Gas piping has no sediment trap. Duct connections are not sealed properly. Allowing for air loss inside the attic. Return has no plenum and is not sealed properly. Air intake duct should be 1 size bigger to allow for more airflow. Tenant said the daughters room is always the hottest. To fix issue and fix airflow, it’s recommended we add another return into the daughters room. Unit is also past its 20 year life expectancy. It’s recommended to change furnaces at