Duct cleaning has never been shown to actually prevent health problems. Neither do studies conclusively demonstrate that particle (e.g., dust) levels in homes increase because of dirty air ducts. This is because much of the dirt in air ducts adheres to duct surfaces and does not necessarily enter the living space.

It's a Mess: Air duct cleaning can be a messy process. The technician will need to access your ductwork, which means they'll likely need to drill holes in your walls or ceilings. This can create dust and debris that will need to be cleaned up after the job is done.

EPA does not recommend that the air ducts be cleaned routinely, but only as needed. EPA does, however, recommend that if you have a fuel burning furnace, stove or fireplace, they be inspected for proper functioning and serviced before each heating season to protect against carbon monoxide poisoning.

Even if your ducts are very dirty, cleaning them likely won't lower dust levels throughout your home. Maintaining clean air ducts in your home probably seems like something you should do.