The ducts that make up a home’s ventilation system pick up dust, lint, dander, and various other particles over time. After a year, a thin layer of debris will already be clinging to the ductwork walls. After a few more years, this build-up can be substantial enough that it will have a negative effect on the performance of the heating and cooling system. Getting rid of this accumulation in the ducts requires professionals with special equipment.
You might think that duct cleaning isn’t that important, but there are a number of benefits to having it done every few years: