Have HVAC Questions? Ask an HVAC Expert for Answers
Hello, fumes inside the home is a serious issue, there will be some carbon monoxide involved.
I will submit a phone call offer, that you may accept or not accept, but that will be fastest.
If the fumes are not entering through a defective vent pipe or open window outside, they would be leaking through a hole in the furnace heat exchanger.... a competent technician will have a carbon monoxide detector that he can use to see if that is the case or not.... about one in 20 service people own one.
The other 19 technicians will tell you that they cannot find the leak