Arrived on site to diagnose unit that is not cooling home down. Unit is from 1987 and original to home. Upon arrival spoke with tenant and he stated unit just is not cooling home down. System has been running they stated since 11 am and dose not bring down to 72 and stays at 75. Had someone else out and advised unit is old and low on charge and due to original ducting in home advised it’s leaking on connections and losing temperature in attic. Found out door unit very old and worn out. Unit is operating very inefficiently and reason why tenant has high bill due to system always running. Checked pressures And are good. Unit is cooling at 20 degrees. Parts are still operating but bad condition. Fan motor had been leaking oil over time. Primary starter is worn out and pitted on contact points. Secondary control is bad but still operating. Unit uses R-22 refrigerant that is no longer in production. But is cooling home but only to and extent due to being a single stage unit and is just no