Performed preventative maintenance for a high efficiency Lennox AC system. Model # is missing , serial #5807E04556 . Upon arrival the thermostat was set for heat. I powered down the thermostat and replaced the batteries supplied by the homeowner. I powered the system down and removed the access panel. The evaporator coils are clean and in good condition. Tested the drain pan , drain line and condensate pump to ensure that there are no leaks or clogs. I replaced the #201 air filter supplied by the homeowner. I checked all electrical connections to ensure that they are secure and in good condition. I re attached the access panels and powered the system back up. I called for AC and observed the system starting normally. The condenser coils are clean and in good condition. The condenser amp draws are .63 for the fan and 6.9 for the compressor. The temperature split is at a 19° differential. The system is operating at this time. I presented the homeowner with several solutions to help impro