Some important FAQ's

Have a look at some duct cleaning service frequently asked questions.

The U.S. Environmental Protection Agency says that “duct cleaning 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, climactic region and level of contamination” and type of duct material. Consumers should beware of air duct cleaning companies that make sweeping claims about the health benefits of duct cleaning, as such claims are unsubstantiated.

Consumers should also beware of “blow-and-go” air duct cleaning companies. These companies often charge a nominal fee and do a poor job of cleaning the heating and cooling system. These companies may also persuade the consumer to pay for unneeded services with and/or without their permission. (If you have knowledge of a practicing “blow-and-go” air duct cleaner, contact your local Better Business Bureau to report the company, and your local, federal and state elected officials to demand legislation.)

Heating, ventilation, and air conditioning (HVAC) systems have been shown to collect a variety of contaminants such as mold, fungi, bacteria and very small particles of dust that have the potential to affect overall health, The removal of such contaminants from the HVAC system and home should be considered one component in an overall plan to improve indoor air quality.

The U.S. Environmental Protection Agency says that “duct cleaning 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, climactic region and level of contamination” and type of duct material. Consumers should beware of air duct cleaning companies that make sweeping claims about the health benefits of duct cleaning, as such claims are unsubstantiated.

Consumers should also beware of “blow-and-go” air duct cleaning companies. These companies often charge a nominal fee and do a poor job of cleaning the heating and cooling system. These companies may also persuade the consumer to pay for unneeded services with and/or without their permission. (If you have knowledge of a practicing “blow-and-go” air duct cleaner, contact your local Better Business Bureau to report the company, and your local, federal and state elected officials to demand legislation.)

You should interview as many local contractors as possible. Ask them to come to your home and perform a system inspection and give you a quote. To narrow down your pool of potential contractors, use the following pre-qualifications:

  • Make sure the company is a member in good standing of NADCA.
  • See if the company has been in business long enough to have adequate experience.
  • Get proof that the company is properly licensed and adequately insured.
  • Verify that the company is certified by NADCA to perform HVAC system cleaning.
  • Make sure that the company is going to clean and visually inspect all of the air ducts and related system components.
  • Avoid advertisements for “$99 whole house specials” and other sales gimmicks.
  • Ask if the company has the right equipment to effectively perform cleaning, and if the company has done work in homes similar to yours.
  • Get references from neighbors if possible.
  • The most effective way to clean air ducts and ventilation systems is to employ source removal methods of cleaning. This requires a contractor to place the system under negative pressure, through the use of a specialized, powerful vacuum. While the vacuum draws air through the system, devices are inserted into the ducts to dislodge any debris that might be stuck to interior surfaces. The debris can then travel down the ducts to the vacuum, which removes it from the system and the home.

    Antimicrobial chemicals are applied by some companies to the interior surface of the air ducts to treat microbial contamination such as fungi (mold), viruses or bacteria. Before any antimicrobial chemicals are used, the system should be thoroughly cleaned. It is critical that any antimicrobial treatment used in your system be registered by the U.S. Environmental Protection Agency specifically for use in HVAC systems. The use of antimicrobial chemicals is an additional service that is not part of a typical air duct cleaning project. Review the NADCA White Paper on Chemical Applications in HVAC Systems for more information. 

    Research by the U.S. Environmental Protection Agency has demonstrated that HVAC system cleaning may allow systems to run more efficiently by removing debris from sensitive mechanical components. Clean, efficient systems are less likely to break down, have a longer life span and generally operate more effectively than dirty systems.