Companies that offer duct cleaning services often advertise health benefits or suggest that the process will reduce energy bills by improving system efficiency. However, there is no data to support these claims. In fact, independent studies indicate that the process of duct cleaning can create a bigger problem than it solves. It is important to hire a top-notch heating and air conditioning contractor to do this type of work, or pay them to do it during your next service visit.
The Environmental Protection Agency (EPA) conducted research to measure the dust levels and efficiency of HVAC systems in test homes over a one-week period during the cooling season. The results showed that cleaning the ducts did not significantly improve dust levels or system performance. Keeping the duct system clean is an important part of overall system maintenance, which in turn improves energy efficiency and reduces utility bills. The easiest way for duct cleaning to improve your utility bills is by eliminating obstructions that can reduce the energy efficiency of your central air conditioner or oven. Many companies market products and services aimed at improving indoor air quality.
While duct cleaning operations may insist that duct cleaning is essential to health, the evidence doesn't support their claims. Manufacturers of products marketed to coat and encapsulate duct surfaces claim that these sealants prevent dust and dirt particles inside air ducts from being released into the air. While many of these products can be legally used inside uncoated ducts if all instructions on the label are followed, some of the instructions on the label may not be appropriate for use in ducts. The application of sealants may also affect the acoustic (noise) and fire retardant characteristics of ducts lined or constructed with fiberglass and may void the manufacturer's warranty. Studies conducted by the governments of the United States and Canada and health professionals who have researched duct cleaning do not recommend that this practice be done, nor do they approve it as a routine measure. The EPA has published several publications for guidance on how to identify potential indoor air quality problems and ways to prevent or fix them. These practices have not yet been thoroughly investigated and you should be fully informed before deciding to allow the use of biocides or chemical treatments in your air ducts.
Typically, a service provider will use specialized tools to remove dirt and other debris from ducts and then vacuum them with a high-powered vacuum. To find companies that offer duct cleaning services, see the section titled Duct Cleaning in the Yellow Pages or contact the National Association of Air Duct Cleaners (NADCA) at the address and phone number listed in the information section at the end of this guide.
