Performed a 2 system spring maintenance ( heat pump). 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,,,noticed both units don’t have surge protection,, talked to customer about installing them,, he will think about it. 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. 11. Inspected evaporator coil,,,evaporator is dirt,, highly recommended an evaporator coil cleaning. 12. Inspected blower motor/ blower wheel,,,there’s buildup around the wiring, and blower wheel,, highly recommended a blower cleaning. 13. Checked blower amp draw. 14. Measured temperature differential,,,temperature differential was 17 degrees split differential, we believe if could also be cause