I was a service technician for a home service company. I was called to a customer's home to repair their air conditioning unit. When I arrived, I discovered that the unit was low on refrigerant and needed to be refilled. I used a special tool to add the refrigerant and then tested the unit to ensure it was working properly. I also replaced the air filter and checked the electrical connections to make sure everything was in good working order. The customer was very pleased with the service and thanked me for my help.