If you are thinking about getting your air ducts cleaned before the heating/cooling season, there are some consumer tips you should be aware of before you hire a technician to do this service; or attempt Do-it-Yourself duct cleaning.
Duct-Cleaning How-To's are not legally mandated, but there are associations that police the industry. A trained technician who understands the intricacies of an HVAC system, and is certified by NADCA is your best bet as a homeowner; but first, know what type(s) of duct material need special attention:
What Your Ducts are likely made of:
A fiberglass board usually covered with aluminum foil on the outside. Several boards can be assembled together to help airflow and maintain temperature. The fiberglass in a duct board serves primarily as an insulation barrier for the air passing through the duct. The metallic foil side of a duct board serves as a vapor barrier. This layer protects moisture from being trapped within the fibers. Many duct boards have their fiberglass treated to also help prevent the spread of air duct mold and fungus through its hardware.
- Pros: Among its many benefits include its lightweight construction and durability.
- Cons: Wetness can be harmful to the fiberglass and can lead to costly replacement.