This Month's Newsletter
Each month, we publish a series of articles of interest to homeowners -- money-saving tips, household safety checklists, home improvement advice, real estate insider secrets, etc. Whether you currently are in the market for a new home, or not, we hope that this information is of value to you. Please feel free to pass these articles on to your family and friends.
Should You Have the Air Ducts in Your Home Cleaned?
Most people are now aware that indoor air pollution is an issue of growing concern and increased visibility.
Many companies are marketing products and services intended to improve the quality of your indoor air. You have probably seen an advertisement, received a coupon in the mail, or been approached directly by a company offering to clean your air ducts as a means of improving your home's indoor air quality.
These 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, climatic region, and level of contamination.
For the complete story, click here...
Also This Month...
9 Buyer Traps and How to Avoid Them
No matter which way you look at it buying a home is a major investment. But for many homebuyers, it can be an even more expensive process than it needs to be because many fall prey to at least a few of the many common and costly mistakes which trap them.
Important Tips To Keep Your Home Safe
It's much more than a physical structure. It's the place where memories are made, where dreams are shared, where lives are lived. And many of your home's contents--the video of your baby's first steps, grandmother's brooch or old family photos, for instance--simply cannot be replaced. That's why it makes good sense to do everything you can to protect your home.
Deciding Whether or Not to Have Your Air Ducts Cleaned
There is substantial visible mold growth inside hard surface (e.g., sheet metal) ducts or on other components of your heating and cooling system. There are several important points to understand concerning mold detection in heating and cooling systems:
- Ducts are infested with vermin, e.g. (rodents or insects); or
- Ducts are clogged with excessive amounts of dust and debris and/or particles are actually released into the home from your supply registers.
Other Important Considerations...
Duct cleaning has never been shown to actually prevent health problems. Neither do studies conclusively demonstrate that particle (e.g., dust) levels in homes increase because of dirty air ducts or go down after cleaning. This is because much of the dirt that may accumulate inside air ducts adheres to duct surfaces and does not necessarily enter the living space. It is important to keep in mind that dirty air ducts are only one of many possible sources of particles that are present in homes. Pollutants that enter the home both from outdoors and indoor activities such as cooking, cleaning, smoking, or just moving around can cause greater exposure to contaminants than dirty air ducts. Moreover, there is no evidence that a light amount of household dust or other particulate matter in air ducts poses any risk to health.
If you think duct cleaning might be a good idea for your home, but you are not sure, talk to a professional. The company that services your heating and cooling system may be a good source of advice. You may also want to contact professional duct cleaning service providers and ask them about the services they provide. Remember, they are trying to sell you a service, so ask questions and insist on complete and knowledgeable answers.
Suggestions for Choosing a Duct Cleaning Service Provider
- To find companies that provide duct cleaning services, check your Yellow Pages under "duct cleaning". Talk to at least three different service providers and get written estimates before deciding whether to have your ducts cleaned. When the service providers come to your home, ask them to show you the contamination that would justify having your ducts cleaned.
- Do not hire duct cleaners who make sweeping claims about the health benefits of duct cleaning -- such claims are unsubstantiated.
- Do not hire duct cleaners who recommend duct cleaning as a routine part of your heating and cooling system maintenance.
- Do not allow the use of chemical biocides or sealants unless you fully understand the pros and the cons.
- Check references to be sure other customers were satisfied and did not experience any problems with their heating and cooling system after cleaning.
- Contact your local consumer affairs or local Better Business Bureau to determine if complaints have been lodged against any of the companies you are considering.
- Interview potential service providers to ensure:
- they are experienced in duct cleaning and have worked on systems like yours;
- they will use procedures to protect you, your pets, and your home from contamination; and
- they comply with air duct cleaning standards and, if your ducts are constructed of fiber glass duct board or insulated internally with fiber glass duct liner, with the North American Insulation Manufacturers Association's (NAIMA) recommendations.
- If the service provider charges by the hour, request an estimate of the number of hours or days the job will take, and find out whether there will be interruptions in the work. Make sure the duct cleaner you choose will provide a written agreement outlining the total cost and scope of the job before work begins.
What to Expect From an Air Duct Cleaning Service Provider
If you choose to have your ducts cleaned, the service provider should:
- Open access ports or doors to allow the entire system to be cleaned and inspected.
- Inspect the system before cleaning to be sure that there are no asbestos-containing materials (e.g., insulation, register boots, etc.) in the heating and cooling system. Asbestos containing materials require specialized procedures and should not be disturbed or removed except by specially trained and equipped contractors.
- Use vacuum equipment that exhausts particles outside of the home or use only high efficiency particle air (HEPA) vacuuming equipment if the vacuum exhausts inside the home.
- Protect carpet and household furnishings during cleaning.
- Use well controlled brushing of duct surfaces in conjunction with contact vacuum cleaning to dislodge dust and other particles.
- Use only soft bristled brushes for fiberglass duct board and sheet metal ducts internally lined with fiberglass. (Although flex duct can also be cleaned using soft bristled brushes, it can be more economical to simply replace accessible flex duct.)
- Take care to protect the duct work, including sealing and re-insulating any access holes the service provider may have made or used so they are airtight.
- Follow standards for air duct cleaning and NAIMA's recommended practice for ducts containing fiber glass lining or constructed of fiber glass duct board.
How to Determine if the Duct Cleaner Did A Thorough Job
A thorough visual inspection is the best way to verify the cleanliness of your heating and cooling system. Some service providers use remote photography to document conditions inside ducts. All portions of the system should be visibly clean; you should not be able to detect any debris with the naked eye. After completing the job, ask the service provider to show you each component of your system to verify that the job was performed satisfactorily.
How to Prevent Duct Contamination
Whether or not you decide to have the air ducts in your home cleaned, committing to a good preventive maintenance program is essential to minimize duct contamination.
To prevent dirt from entering the system:
- Use the highest efficiency air filter recommended by the manufacturer of your heating and cooling system.
- Change filters regularly.
- If your filters become clogged, change them more frequently.
- Be sure you do not have any missing filters and that air cannot bypass filters through gaps around the filter holder.
- When having your heating and cooling system maintained or checked for other reasons, be sure to ask the service provider to clean cooling coils and drain pans.
- During construction or renovation work that produces dust in your home, seal off supply and return registers and do not operate the heating and cooling system until after cleaning up the dust.
- Remove dust and vacuum your home regularly. (Use a high efficiency vacuum (HEPA) cleaner or the highest efficiency filter bags your vacuum cleaner can take. Vacuuming can increase the amount of dust in the air during and after vacuuming as well as in your ducts).
- If your heating system includes in-duct humidification equipment, be sure to operate and maintain the humidifier strictly as recommended by the manufacturer.
To prevent ducts from becoming wet:
Moisture should not be present in ducts. Controlling moisture is the most effective way to prevent biological growth in air ducts.
Moisture can enter the duct system through leaks or if the system has been improperly installed or serviced. Research suggests that condensation (which occurs when a surface temperature is lower than the dew point temperature of the surrounding air) on or near cooling coils of air conditioning units is a major factor in moisture contamination of the system. The presence of condensation or high relative humidity is an important indicator of the potential for mold growth on any type of duct. Controlling moisture can often be difficult, but here are some steps you can take:
- Promptly and properly repair any leaks or water damage.
- Pay particular attention to cooling coils, which are designed to remove water from the air and can be a major source of moisture contamination of the system that can lead to mold growth. Make sure the condensate pan drains properly. The presence of substantial standing water and/or debris indicates a problem requiring immediate attention. Check any insulation near cooling coils for wet spots.
- Make sure ducts are properly sealed and insulated in all non-airconditioned spaces (e.g., attics and crawl spaces). This will help to prevent moisture due to condensation from entering the system and is important to make the system work as intended. To prevent water condensation, the heating and cooling system must be properly insulated.
Should chemical biocides be applied to the inside of air ducts?
Air duct cleaning service providers may tell you that they need to apply a chemical biocide to the inside of your ducts to kill bacteria (germs), and fungi (mold) and prevent future biological growth. Some duct cleaning service providers may propose to introduce ozone to kill biological contaminants. Ozone is a highly reactive gas that is regulated in the outside air as a lung irritant. However, there remains considerable controversy over the necessity and wisdom of introducing chemical biocides or ozone into the duct work.
Little research has been conducted to demonstrate the effectiveness of most biocides and ozone when used inside ducts. Simply spraying or otherwise introducing these materials into the operating duct system may cause much of the material to be transported through the system and released into other areas of your home.
In the meantime...
Before allowing a service provider to use a chemical biocide in your duct work, the service provider should:
1. Demonstrate visible evidence of microbial growth in your duct work. Some service providers may attempt to convince you that your air ducts are contaminated by demonstrating that the microorganisms found in your home grow on a settling plate (i.e., petri dish). This is inappropriate. Some microorganisms are always present in the air, and some growth on a settling plate is normal. As noted earlier, only an expert can positively identify a substance as biological growth and lab analysis may be required for final confirmation. Other testing methods are not reliable.
2. Explain why biological growth cannot be removed by physical means, such as brushing, and further growth prevented by controlling moisture.
If you decide to permit the use of a biocide, the service provider should:
1. Show you the biocide label, which will describe its range of approved uses.
2. Apply the biocide only to uninsulated areas of the duct system after proper cleaning, if necessary to reduce the chances for regrowth of mold.
3. Always use the product strictly according to its label instructions.
While some low toxicity products may be legally applied while occupants of the home are present, you may wish to consider leaving the premises while the biocide is being applied as an added precaution.
Do sealants prevent the release of dust and dirt particles into the air?
Manufacturers of products marketed to coat and seal duct surfaces claim that these sealants prevent dust and dirt particles inside air ducts from being released into the air. As with biocides, a sealant is often applied by spraying it into the operating duct system. Laboratory tests indicate that materials introduced in this manner tend not to completely coat the duct surface. Application of sealants may also affect the acoustical (noise) and fire retarding characteristics of fiber glass lined or constructed ducts and may invalidate the manufacturer's warranty.
Questions about the safety, effectiveness and overall desirability of sealants remain. For example, little is known about the potential toxicity of these products under typical use conditions or in the event they catch fire.
In addition, sealants have yet to be evaluated for their resistance to deterioration over time which could add particles to the duct air.
Most organizations concerned with duct cleaning, do not currently recommend the routine use of sealants in any type of duct. Instances when the use of sealants may be appropriate include the repair of damaged fiber glass insulation or when combating fire damage within ducts. Sealants should never be used on wet duct liner, to cover actively growing mold, or to cover debris in the ducts, and should only be applied after cleaning according to appropriate guidelines or standards.