Burning smell from furnace vent. Overheating components 2. The heat exchanger functions by cycling heat from the combustion chamber into the plenum, and if this part is broken, the risk of fire Oct 12, 2022 · A burning smell from the AC can be alarming. Electrical issues 3. It started blowing soot through the vents and this morning, the smell of It’s the middle of winter, your furnace is working overtime, and suddenly you smell something burning. Electrical Problems Behind Walls This is 2 days ago · Dust accumulating on heating elements or inside vents will burn off when a furnace or heater kicks on for the first time in a season, producing a sharp, acrid smell that usually fades within an hour. The most serious is the potential for carbon monoxide (CO) poisoning. – accumulated dust burns off when the system starts, producing a temporary smoky or burnt odor. Fortunately, a burning odor emanating from the air conditioner or vents is not usually dangerous or indicative of a fire. This article explains likely causes, immediate safety steps, troubleshooting and maintenance tips, and when to call a professional to restore safe, odor-free heat. Smell of Chemicals If you smell chemicals after turning on your furnace, this is definitely something you shouldn’t ignore. hjjkf odvhk sxjnyr ktyso lclec pzi iqr znaxbjfn xfv tey