I was called to a home to service a split heat pump Goodman system. Upon arrival, I found that the system was not cooling properly. I checked the refrigerant levels and found that they were low. I added more refrigerant and tested the system again. The system was now cooling properly. I also checked the air filter and found that it was dirty. I cleaned the air filter and tested the system again. The system was now cooling properly. The customer was happy with the service and paid me for the service.