What is Air Duct Cleaning? 
Most people are now aware that indoor air pollution is an issue of growing concern and increased visibility. Many companies are marketing products and services intended to improve the quality of your indoor air. You have probably seen an advertisement, received a coupon in the mail, or been approached directly by a company offering to clean your air ducts as a means of improving your home’s indoor air quality. These services typically — but not always — range in cost from $450 to $1,000 per heating and cooling system, depending on the services offered, the size of the system to be cleaned, system accessibility, climatic region, and level of contamination. Duct cleaning generally refers to the cleaning of various heating and cooling system components of forced air systems, including the supply and return air ducts and registers, grilles and diffusers, heat exchangers heating and cooling coils, condensate drain pans (drip pans), fan motor and fan housing, and the air handling unit housing Remove Mold for a Healthy Home 
Exposure to mold can cause cold-like symptoms, respiratory problems, nasal and sinus congestion, watery eyes, sore throat, coughing and skin irritations, and can trigger asthma attacks. Because some mold spores are very small and can easily be breathed deeply into the lungs, it is not safe to live in houses with high mold levels. Exposure to high mold spore levels can cause development of an allergy to mold. People can react to mold whether it is living or dead. According to the American College of Allergies, 50% of all illness is aggravated or caused by polluted indoor air. The Environmental Protection Agency (EPA) themselves declare that indoor air is anywhere from 2 to 10 times more hazardous than outdoor air. 
The EPA also warns us that the indoor air quality is the United States’ number one environmental health problem. Today’s homes and buildings are built air-tight, and contain a long list of pollution sources (see list). As a result, natural air-cleansing agents such as ozone and negative ions are kept out, while contaminants are kept in. A recent study found that the allergen level in super-insulated homes is 200% higher than it is in ordinary homes. According to Scientific America, a baby crawling on the floor inhales the equivalent of 4 cigarettes a day, as a result of the outgassing of carpets, molds, mildews, fungi, dust mites, etc. Most people spend well over 90% of their time indoors. In which case, indoor air is going to impact our health far more than outdoor air. 
The EPA informs us that 6 out of 10 homes and buildings are “sick”, meaning they are hazardous to your health to occupy as a result of airborne pollutants.