Your ductwork, like any other part of your house, collects dust and other dirt. Without regular cleaning, mildew, mold, and bacteria can form in your air ducts, causing your home to smell bad when your HVAC system turns on.
Regardless of whether your heating or air conditioning is on, unpleasant odors will begin to linger in the air over time. And until you get rid of the cause of the scents, the stench will linger in your home. Professional Odour Removal Services in Caroline Springs can help with this.