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Improving Your Indoor Air Quality By Having Your Ducts Cleaned

People want to know the facts about Indoor Air Quality (IAQ) and if duct cleaning will improve the quality of the air we breathe. The facts below should help you understand that while air vent cleaning is not a "cure-all," it is an important step in improving IAQ. Duct cleaners across the USA agree that cleaning ducts help to significantly reduce the source of contaminants and various pollutants which may trigger reactions in your health.

Heating and air conditioning ducts are dark, damp and rich in "nutrients" which in turn makes for a breeding ground for mold, fungi and dust mites. These allergens can spread rapidly since the ducts are used to spread air around the house. You can also prevent these allergens from spreading by improving your ventilation and changing your filters regularly. Mold and fungi can cause disease, infections and most commonly trigger allergic reactions.

Duct cleaning alone won't solve the problems of Asthma and allergies in your home of course, but it does play a significant role in the prevention of these things. By cleaning your HVAC system you will remove allergens like dust and mold from the ductwork as well as residue from cigarette smoke. There is no EPA-recommended timeline for how often you should clean your ducts, but most furnace manufacturers say that the furnace itself should be cleaned once a year.

If your furnace needs to be cleaned annually, why not get your air ducts cleaned at the same time?

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Here Are Some Interesting Facts To Consider:


  • Indoor air pollution is ranked among the top 5 environmental dangers to the public. (EPA)
  • Studies have shown that two out of three indoor air quality problems involve the HVAC/Duct System.
  • Children and the elderly are especially affected by polluted indoor air. (Department of Consumer Affairs)
  • Volatile Organic Compounds (VOCs) in indoor air can be 2 to 5 times greater than in outdoor air. (EPA)
  • 20% of all illnesses are either caused by or aggravated by, polluted indoor air. (American College of Allergists)
  • The levels of some hazardous pollutants in indoor air have been found to be up to 70 times greater than in outdoor air. (USEPA)
  • Most people spend 60% to 90% of their time indoors. (American Lung Association & EPA)


  • More than 50 million Americans suffer from allergies.
  • One out of six people who suffer from allergies do so because of the direct relationship to fungi and bacteria in air duct systems. (Total Health and Better Health Magazines)


  • 10-12 million Americans suffer from Asthma. (American College of Allergists)
  • Over 7.6 million children (5-17 years) and over 12.7 million young adults (18-44 years) suffer from asthma. (National Center for Health Statistics)


  • Each person can shed up to 700,000 skin scales per day creating an abundant food source for dust mites.
  • About 40,000 dust mites can "thrive" in only one ounce of dust
  • Approximately 10 to 15 percent of the population suffers from an allergy related to dust mites.


  • Airflow problems can reduce your system's efficiency by up to 15 percent. (
  • A buildup of .042 inches of dirt on a heating or cooling coil can result in a decrease in efficiency of 21%. (EPA)
  • Most commercially available fiberglass furnace filters are less than 7% efficient. (ASHRAE)
  • Dirty coils reduce the system's ability to cool your home and cause the system to run longer, increasing energy costs and reducing the life of the equipment. (
  • Too much or too little refrigerant will make your system less efficient increasing energy costs and reducing the life of the equipment. (
  • 9 out of 10 system failures are caused by dirt and dust.
  • In 1998, clothes dryers were associated with 15,600 fires, which resulted in 20 deaths and 370 injuries. (Consumer Product Safety Commission)


  • A full load of wet clothes placed in a dryer contains about one half gallon of water. As water is removed, lint is created from the clothes. (UL - Underwriters Laboratories)
  • Lack of maintenance is a contributing factor of clothes dryer fires. People aren't cleaning lint traps as often as they should nor are they checking and cleaning vent systems on a periodic basis. (UL)
  • The U.S. Fire Administration's most recent study reports residential clothes dryer fires were associated with 12,700 fires nationally, resulting in 15 deaths and 300 injuries annually.

We are the Puget Sound's choice for service and repair on home heating, air conditioning, and HVAC systems.

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We have the best service technicians in the business. That's why we back all of our repairs with a 100% guarantee.

If you are having problems with your gas furnace, air conditioning, heat pump, ductless heat pump, or hot water heater, we'll have a professional service tech out to your home within hours.

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Evergreen Home Heating and Cooling Service Van

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•  Our unique flat-pricing system makes budgeting easy.

•  Forty years of industry knowledge and experience

•  We’re dedicated to residential service 24/7

•  All our installers are seasoned, certified technicians.

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727 S. Kenyon St.
Seattle, WA 98108


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