Arrived on site to pet heating tune up on a 1995 corsaire unit. Clustered no issues that he knows of. He stated he is the tenant and is renting so he is not the owner or property. Cycled heater found mercury thermostat. Advised there not as accurate at reading temperature. Unit is operational filter was replaced. Found black flex ducting used found unit to maybe original to home as unit is not up to code. Blower assembly is dirty. Motor is leaking oil from over working and age. Found secondary motor control bad and will be failing at n future. Motor is on borrowed time. Inducer motor is almost at max. Igniter is high in range and is discoloration is white and can fail in future. Flame sensor is oxidized but okay. Tempted rise is in range. Found drain lines dusty with no over flow switches or an emergency drain pan under unit. Found gas line to not have any sediment trap. Furnace is on 2x4 instead of furnace stands. No protection on unit and recomadding one to protect older unit. John s