I was called to a home to check on an air conditioner that was not working. Upon arrival, I found that the unit was running but not cooling the home. I checked the unit and found that the condenser coil was dirty and clogged with debris. I cleaned the coil and the unit started cooling the home again. I also checked the refrigerant levels and found that they were low. I added more refrigerant and the unit started cooling the home again. The homeowner was very happy with the service and thanked me for my help.