Arrived on site for dryer vent cleaning and heating maintenance. Homeowner stated all was well with regards normal unit operation to his knowledge proceeded with heating maintenance as scheduled. 1.;Visually inspected condenser coil for debris/ dirty. 2. Inspected condenser fan motor. 3. Inspected condenser fan blades. 4. Inspected/ cleaned wiring connections. 5. Tested for gas leaks 6. Tested functionality and cleaned flame sensor 7. Tested functionality and cleaned pressure switches and ports 8. Inspected / replaced return filter. 9. Inspected return plenum for debris/ dirty. 10. Inspected evaporator coil. 11. Tested functionality and visually inspected surface igniter 12. Checked blower amp draw. 13. Measured temperature differential from supply to return. 20 degrees measured. Observed both blower wheels had a large amount of dust on them. This creates drag on the motor, causing it to work harder and ultimately shortening the lifespan. I would recommend cleaning both blower wheels
