The moisture and dirt that can be found in the air-conditioning systems provide an ideal breeding ground for mold, germs, fungi, and other harmful microbes. As air passes through, it picks up those harmful materials throughout the indoors environment. These contaminates create not only an adverse working environment but also pose major health risks to people who suffer from allergies, asthma and other respiratory ailments. Regularly maintaining a good air quality improves the working environment and human health.