Almost every home has air ducts of some kind, whether a central HVAC or heat exchange unit. And the majority of these systems use straight, galvanized steel pipe instead of the accordion type. And although the flex pipe is easier to attach to stringers the smooth pipe allows for better airflow and will not trap lint and other particles in its folds the way the flex pipe does.

Mold and Allergens

However, even smooth ducting can get coated with dirt and lint. There are elbows and other roadblocks that slow down the flow and allow particles to build up. In addition, some particles are charged or moist and will “plate” onto the surface. This build-up can create indoor air pollution because mold and mites can breed and release spores, bacteria and other toxic by-products into the air. Occupants with allergies can be severely affected by these airborne particles and this is why regular cleaning should be practiced.

Complete Cleaning

Cleaning a complete set of ductwork can run between $200 and $1000, depending on the size and scope of the system. In some cases a cleaning company will charge more because the pipes are in hard-to-reach places. A duct cleaning company should agree to clean out all systems including drip trays, fans, grills, diffusers, heat exchange units, filter systems, fan motors and housing and furnace filters. All exhaust should go straight outside. As well, the company should provide drop sheets and other protective measures for the home and possessions.

Chemical Poisoning

If the professional cleaning company is going to use chemical cleaners find out what they are. Sometimes the chemicals will be worse than the organic allergens. There are environmentally-safe cleaners on the market so make sure the cleaning  company understands you don’t want chemicals.

Interviewing the Cleaning Company

- Do they belong to NADCA (The National Air Duct Cleaning Association)? This organization has standards and the company should be able to show membership.

- Ask how many years the company has been in business

- Ask for references and check them

- Check the better Business Bureau. This is not a determining factor but the information will help you top decide.

- Are they licensed for the area (if necessary)?

Remember, a novice company with inexperienced people, no matter how well-intentioned, can release harmful pollutants into the home that cn have serious consequences down the road. So go for experience.