I had quite the concerning smell coming from my Heating plus A/C machine vents at the beginning of this past Winter. I barely was even able to detect it at first. I had just started using my gas furnace as it was starting to get extremely frigid in the Last month of November… By the first week of December, the smell I was smelling was incredibly faint however unmistakable. At least, I thought it was. The smell coming from the heat exchanger vents to me smelled like gas. In my life, I have learned to not play around with gas smells, so I ventilated my residence plus then vacated it instantly plus called a Heating plus A/C machine professional. It turns out the smell wasn’t exactly what I expected it to be. The Heating plus A/C professional asked me where the gas smell was coming from plus I informed him that it was clearly originating from the vents. He told me that he was sure it would be safe enough for him to come out plus inspect the residence, because he suspected that he knew what the issue was, plus it wasn’t gas! When he arrived, his suspicions were confirmed. It turns out that dust can collect on the heat exchanger throughout the year. I suppose that is to be expected, however once you first start using your furnace in the Winter, that heat can cause the dust to emit a burning type of smell. It turns out that this burning smell from the dust is truly similar to the smell of gas. I was just relieved that it wasn’t a gas leak or something serious plus I just needed to scrub my heat exchangers a little!