Cleaned and checked air conditioner. Check drain. Check voltage and amp draw of motors. Test capacitors. Checked Freon level: Low. Temperature drop only 13.5. Humidity: 56%. Topped off to proper level per superheat chart. System may have a Freon leak. Found low latent heat to sensible heat removal ratio. Enthalpy Delta: 5.75. I adjusted blower speed for proper dehumidification and efficiency. Cleaned condenser coil. Compressor:14A .Condenser fan: 1.25A. Blower: 5.7 A .ambient: 89.liquid line: 96 .suction line: 60.metering device: piston . Suction pressure:136(48) . Return air: 78 .supply air: 57.5.wet bulb:66 . Enthalpy delta:7.3. 4 ton AC. 5 ton evaporator. Filter sucked out of place. Installed filter retainer.