We had a rental with forced hot air heat by oil l. The tenants would occasionally complain of an odor. I had the furnace serviced every year and each time I mentioned the odor. The technician tested carbon monoxide and efficiency. Both good. I had co detectors in the living space per code so I wasn't too concerned.
I had the old furnace replaced a couple of years ago and the technician discovered that the heat exchanger had 3 inch hole that rusted through.
It was probably there for years and no one checked for it.
So if you smell something when the furnace is running check the heat exchanger.
Last edited by loony; 02-13-2022 at 11:26 PM.
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