Heat performance tuneup times three systems. Changed out filters client supplied. Inspect blowers, evaporators and ductwork. Motor on living room furnace is failing. It is very noisy and needs to be replaced. The upstairs blower motor is showing signs of fatigue and wear. And second stage, I was recording 6 to 7 ppm carbon monoxide. I am leaving an estimate to repair the living room and replacement for the upstairs furnace.