Symptoms of Indoor HVAC  Air Pollution: Allergies, Illnesses, Eye irritation, Sinus congestion Headache, Sore throat, Nausea, Colds & Flu Asthma & increased asthma symptoms Diseases, Fatigue, Cough, Congestion Tightness in chest, Wheezing and hypersensitivity Eye, nose & throat irritation

If no one in your household suffers from allergies or unexplained symptoms or illnesses and if, after a visual inspection of the inside of the ducts, you see no indication that your air ducts are contaminated with large deposits of dust or mold (no musty odor or visible mold growth), having your air ducts cleaned [...]