Performed fall home care on two 3yr old Lennox units, checked tstst, cycled to heat mode, replaced both filters, recommend wet switches for both units, inspected blower wheels, cleaned flame sensors, checked igniters, inducer motors, temp splits, flushed and cleaned drain lines, no co or gas detected, spoke with customer about dehumidifiers, explain they have both drain lines running to upstairs primary drain, explained they should be on there own dedicated drain lines, recommend running new drains, customer declined just wanted to do minor drain repair and run each humidifier to each system drain, reran both drain lines running, secured and glued all pvc , made sure lines was draining properly and had proper fall, recommend ss2 switches for extra flood protection, also recommended indoor air quality, inspected outdoor units , checked pressures, temp splits, went over all options , customer chose option b on both systems, and also to repair drain lines, installed both ss2 switches made