I was a home service technician, and I received a call from a customer who reported a problem with their air conditioner. When I arrived, I found that the air conditioner was not cooling the house properly. I checked the thermostat and found that it was set to 72 degrees, but the temperature in the house was only 68 degrees. I checked the air filter and found that it was very dirty, so I replaced it with a new one. After that, I checked the condenser coil and found that it was dirty, so I cleaned it with a coil cleaner. Finally, I checked the refrigerant levels and found that they were low, so I added more refrigerant to the system. After completing these repairs, the air conditioner started cooling the house properly again. The customer was very happy with the service and thanked me for my help.