Frequently Asked Questions
Are there any health benefits that come from  HVAC  system cleaning?

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

Will  HVAC  system cleaning reduce our home energy bills?

Research by the  U.S. EPA 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.

What kind of equipment is best for cleaning - truck-mounted vacuums or portable vacuums?

NADCA does not endorse one kind of equipment over another. There are two main types of vacuum collection devices: (1) those mounted on trucks and trailers, and (2) portable units. Truck/trailer mounted equipment is generally more powerful than portable equipment. However, portable equipment can often be brought directly into a facility, allowing the vacuum source to be located closer to the ductwork. Both types of equipment will clean to NADCA standards.
All vacuum units should be attached to a collection device for safe containment prior to disposal. Any vacuum collection device which exhausts indoors must be HEPA (high efficiency particulate arrestance) filtered.
A vacuum collection device alone will not get an HVAC system clean. The use of methods and tools designed to agitate debris adhered to the surfaces within the system, in conjunction with the use of the vacuum collection device(s), is required to clean HVAC systems. (For example: brushes, air whips, and  skipper balls.)

How often should HVAC systems be cleaned?
Frequency of cleaning depends on several factors, not the least of which is the preference of the home owner. Some of the things that may lead a home owner to consider more frequent cleaning include:
  • Smokers in the household.
  • Pets that shed high amounts of hair and dander.
  • Water contamination or damage to the home or HVAC system.
  • Residents with allergies or asthma who might benefit from a reduction in the amount of indoor air pollutants in the home’s HVAC system.
  • After home renovations or remodeling.
  • Prior to occupancy of a new home.
What is a normal price range for air duct cleaning system?

The Environmental Protection Agency says that "duct cleaning services typically - but not always - range in cost from $450 to $1000 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 making sweeping claims about the health benefits of duct cleaning 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 into 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.)

What criteria should I use in selecting an HVAC system cleaner?
Interview as many local contractors as you can. Ask them to come to your home and perform a system inspection and give you a quotation. To narrow down your pool of potential contractors, use the following pre-qualifications:
  • Make sure the company is a member in good standing of the National Air Duct Cleaners Association (NADCA).
  • See if the company has been in business long enough to have adequate experience.
  • Enquire whether the company is in good standing with your local Better Business Bureau.
  • 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.
What are Sanitizers and why should they need to be used?

Sanitizers are anti-microbial chemicals applied to the interior surface of the air ducts, designed to control microbial contamination. Before any sanitizers are used, the system should be thoroughly cleaned. It is critical that any anti-microbial treatment used in your system be EPA registered for the intended use in HVAC systems. Ask to see the chemical’s Material Safety Data Sheet (MSDS). If you are still concerned, call the EPA at 1-800-438-4318. It should be noted that there are no EPA registered anti-microbial products for use on porous system surfaces such as fiberglass surfaces.

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