A professional may inspect thermostat signals, airflow, indoor and outdoor fans, condensate drainage, refrigerant-system performance, and electrical components. The appropriate repair depends on measured findings. Equipment replacement and new installations are separate decisions; see AC installation if you are considering a new system.
A qualified technician can confirm the diagnosis, repair options and scheduling. Your call is not a confirmed appointment.
A complete diagnosis should distinguish the symptom from the failed component. Refrigerant handling and electrical testing require qualified service; changing parts without confirming the cause can leave the original problem unresolved.