Performed preventative maintenance on Carrier AC system. Customer replaced Aprilaire 413 (16x25x4) filter a month prior to us coming out, filter is still good. Tested evaporator coil pan and drain line for proper drainage. Temperature split is at 20° with a supply air temperature of 46°. Refrigerant pressures: Low side- 96 psi High side- 180 psi , these refrigerant pressures are accurate for the outdoor temperature today of 60°. Unit has a sub cool of 11. Compressor- 8.8 RLA Condenser fan motor- 0.8 FLA These readings are both within the proper amperage rating for this unit. System is operating properly at this time and is ready for the Season.