The duct system in your home functions as the respiratory system. Contaminants such as dust, dirt, pollen, animal dander and other airborne organisms are sucked into your system every time your furnace or air conditioner runs. If the system is not properly installed, maintained and operated, these components can become contaminated with these particles. If moisture is present, the potential for microbacterial growth is increased and may be released into your living space. Many of these contaminants cause allergic reactions and/or other respiratory issues for you and your family when exposed to them. These contaminants will build up in your air duct system over a period of time making your system a breeding ground for mold spores, bacteria, fungus, mildew and other microbes, impacting the quality of air and comfort for your family. Allergic reactions to pollen, bacteria, dust mites feces and mold are common for many people. These particles and their pollutants settle in the air ducts and re-circulate every time the furnace blower is turned on. Cleaning and sanitizing your air ducts will not only eliminate most contaminants but also may improve the efficiency of your air conditioner/furnace buy improving the air flow. Doctors, particularly allergists, are more often "prescribing" air duct cleaning as a potential remedy for health problems related to indoor air quality. Those who suffer from allergies, asthma or other respiratory ailments are most vulnerable to the effects of indoor air pollution (especially children and elderly).