Upon arrival, I found a customer’s straight, cool condenser with gas furnace that supplies the guest house above the garage, not cooling properly due to a low refrigerant charge, and the thermostat needing to be reprogrammed. I sent an estimate for a couple pounds of Freon and to reprogram the thermostat. After adding refrigerant, I reprogrammed the thermostat and tested the system operations. Your system is operating/cooling properly at this time however, I did find a severely rusted bi-Flo filter drier in the condenser. I Will get an estimate created to replace it. I would recommend replacing it ASAP