Arrived on site for dryer vent, cleaning and heating maintenance. Homeowner stated all was well with regards to 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. Noticed decent amount of dust buildup on the blower wheel. This creates drag on the motor, causing the motor to work harder ultimately shortening the lifespan of the motor. Recommend blower wheel clea