Performed preventative maintenance for a high efficiency Coleman AC system. Model #TC4B3622S, serial #W1L8293171.upon arrival the thermostat was turned off. I powered down the system and removed the access panels. The evaporator coils are clean and in good condition. I tested the drain pan and drain line with several bottles of water to ensure that there are no leaks or clogs. I replaced the air filter with a 16x25x1 pleated 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 1.1 for the fan and 6.8 for the compressor. The temperature split is at a 19° differential. No charge for today. Homeowner is a Chu Club Member.