Even homes without pets accumulate dust and allergens over time. Things like pollen, mold spores, dust mites, and outdoor pollutants all build up on interior surfaces and inside air ducts. When these particles circulate through your central HVAC system, it can cause allergy symptoms for sensitive people. Getting comprehensive professional duct cleaning done every few years eliminates the layer of microscopic irritants sticking inside your ventilation system. Thorough cleaning removes the allergen pathway into your living areas. Adding advanced air filtration can also help trap recirculating particles between annual cleanings.