I&rsquo;m looking into <strong data-start="317" data-end="390">professional furnace and duct cleaning for my home and wondering how often homeowners usually schedule this service. I&rsquo;ve noticed some dust around the vents and want to make sure the heating system is properly maintained before the colder months. Is professional cleaning recommended annually, or does it depend on the age and condition of the furnace and ductwork?