Tested system not cooling for the main level area of the home. Found the system is low on refrigerant and leaking in the evaporator coil. The system has high static due to lack of return air and many other parts are failing along with system needing cleanings. Also tested the compressor that is making a lot of noise on the upstairs level system. Found this compressor is making the noise due to failing rotors. Due to the condition, age, and poor installation it might be time to think about getting a brand new system.