Arrived on site to diagnose a leaking 1989 unit. Client stated She is original home buyer and heater is original. She has a separate insurance but when they came out they told her they don’t cover it and need it all replaced but didn’t even inspect the unit. Found unit all opened up. Return vent was open and off and inside was wet. Furnace located in closet and found wood base all wet. Drain is clogged and there is only one. No safety over flow switches. Blower assembly and wheel and whole cabinet of heater was really dirty as there is no rack to hold filter in place so dirt is just entering unit. Found motor leaking oil as there is a lot of oil build up and dirt on motor. Due to age of unit a lot of part are just worn out from age and operation. Found no good airflow upstairs. Inspected ducting and found it to be original gray flex and most of it has all deteriorated and has left the duct itself exposed with no insulation. Advised there are loosing cold and hot air in attic and fo