Most homes are heated using a furnace and a duct system that distributes hot air into different rooms. This system is made up of both "return" ducting that brings cold air into your furnace and "supply" ducting that distributes warm air throughout your home.
Since your ductwork is open to your household air, it can easily collect dust, hair, pet dander, and other debris from your home. This is especially true of the return ducts that feed air into the furnace. Having a good duct cleaning becomes essential.
A good duct-cleaning will help to remove dust, dirt, and hair, along with any toys, pens, or things like jewelry that may have been dropped into the duct work. Some believe that cleaning your air ducts will improve your indoor air quality since your ducts should be spotless after they've been thoroughly cleaned, while others say it has little effect on air quality.
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