It is recommended to have your air ducts cleaned roughly every 5 years. This will cut down on the amount of bacteria and mold within the system. People moving into a different home should have their air ducts cleaned, unless it was done by previous owner. After remodeling projects, it is wise to have your air ducts cleaned to remove any saw dust and/or drywall dust.
We also do dryer vent cleaning. The dryer is an appliance we typically use daily. The vent gets restricted with lint that passes through the lint trap. Cleaning this vent will improve your drying time saving you money on electrical costs and can reduce the risk of a vent fires.