Upon arrival, I found that the air handler unit (AHU) and condenser unit were both operating normally. However, the customer reported high humidity levels in the home. I used a psychrometer to measure the temperatures and humidity levels and found that the Tsat was not reading correctly and the humidity levels were different from the Tsat readings. I recommended installing two surge protectors for the AHU and condenser unit and replacing the Tsat. I also checked the pressures and temperatures and everything was looking good.