Duct cleaning is not high on the priority list for most homeowners. But did you know that the air you breathe inside your home could be dirtier than the air outside? Home heating, ventilation, and air conditioning systems can be magnets for all kinds of irritants, from microscopic dust particles to mold and fungi. Have your duct system professionally cleaned every other year and change heating and cooling filters regularly to keep your home systems clean as well as improve their efficiency.