Performed a 2 system spring maintenance (gas). Tasks performed. 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 compressor/ condenser fan motor capacitor. 6. Checked refrigerant pressures. 7. Checked compressor amp draw. 8. Checked condenser fan motor amp draw. 9. Inspected / replaced return filter. 10. Inspected return plenum for debris/ dirty,,,both units are very dusty, highly recommended a duct cleaning. 11. Inspected evaporator coil. 12. Inspected blower motor/ blower wheel,,,downstairs unit blower is very dusty, highly recommended a blower cleaning. 13. Checked blower amp draw. 14. Measured temperature differential,,,,upstairs unit is right on the edge,, it’s 18 degrees split differential,, homeowner is aware of this , he will monitor the unit and keep us updated. 15. Inspected drain lines. 16. Washed condenser unit.