I arrived at the client's home and performed an AC maintenance checklist. I checked the AC unit's electrical connections, cleaned the air filters, checked the refrigerant levels, and tested the AC unit's operation. I also checked the thermostat and made any necessary adjustments. After completing the checklist, I provided the client with a detailed report of my findings and recommendations for any additional maintenance or repairs that may be needed. The client was very satisfied with the service and thanked me for my professionalism and attention to detail.