Arrived on site to perform spring maintenance on 2015 Lennox system. Condenser located in back yard. Furnace and evaporator coil located in attic. Client stated no issues just wanted to ensure this is no issues with drain lines. Hey had system running and cooling upon arrival. Condenser was really clogged with dog hair and hair. Checked fan blades, bearings, and motor. Checked electrical compartment circuit board and components. All good. Primary control is good. Amp drawls on compressor and fan motor are both in range. Refrigerant pressure are good. Found no protection on units. Cycled system to ensure system operating. Did attic and indoor inspection. Found new flex ducting used. Filter was dirty and old. Recommend replacing filter and doing so as needed to reduce amount of dirt entering system. Blower wheel has light dust. Motor is good. Evaporator coil is good at this time. Drain lines are good. Blew drain lines out. Inspected drain line and found connections from drain line and T-