Arrived at home to perform AC safety check. Found dirty 20x30x1 air filter in ceiling. Condenser coil dirty, weak/failing condenser fan motor, weak/failing capacitor for fan motor, amaflex insulation deteriorated on outdoor equipment, tree has grown beside equipment squeezing against line set and could potentially create a critical failure. Charred contactor could become pitted closed and cause a critical failure. Indoor equipment return air duct is taped directly to furnace and is deteriorating. Drain pan rusted. Washed outdoor coils. Homeowner considering replacement over repairs. Leaving estimates for repair and replacement options.