If any part of your AC system starts to smell, it's time to give us a call. A bad smell from your AC can quickly permeate your home which is miserable in itself, but also the sign of bigger problems. From issues that block airflow to dirty filters or over heating and burning wires, more investigation and regular ac maintenance are needed to ensure your comfort and safety. If you notice a foul odor coming from the vents, surrounding areas, or anywhere in your unit, turn off the system for safety and call bhild right away.