2022 Carrier AC is running in great condition. 20x25x4 air filter in good condition. Visual inspection of indoor coil. Flush drain pan and drain lines. Humidifier damper is closed. Run test unit in cooling mode from thermostat. Delta t of 21F with supply temp of 50F. Refrigerant pressures are within spec. High 275psi with 11F SC, low 115psi with 10F SH. Water flushed outdoor coils to remove dirt and debris. Outdoor fan motor and compressor are operating within specs. System is operating properly, efficiently and ready for Summer. Regarding concerns of temperature differences between floor levels, recommend closing register ins basement, partially closing som on the first floor in areas that are not used often, make sure all registers on second floorare open, and leaving fan setting on thermostat in ON mode to continuously run the fan. All of these combined will help lower the temperature difference, but it will not eliminate it.