Running a space heater or central heating system that emits a burning smell requires caution and depends on the specific scent. If it is a mild, dusty odor during the first seasonal startup of a central furnace, it is usually harmless seasonal burn-off that clears quickly. However, if the heater smells like melting plastic, burning dust from being covered by foreign objects, or acrid electrical insulation, it is not safe to run. Continuing to operate a heater under these conditions can lead to severe component damage or a dangerous residential fire. You should turn the unit off immediately, inspect for trapped debris or blocked airflow, and ensure it is plugged directly into a wall outlet rather than an extension cord.
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