Air-duct cleaning removes the dust and debris that accumulates in home ductwork. It also reduces the fungus, mildew and bacteria that can cause allergic reactions in sensitive people. It has been shown to make indoor spaces more comfortable and healthier, and it is an excellent supplement to other measures that improve indoor air quality.
There is no consensus on how often a duct system should be cleaned, but most experts recommend that it be done at least every three to five years. It is important to find a certified contractor, as one who uses NADCA-endorsed methods will perform a thorough job and avoid damaging the ductwork.
Dirty ducts can harbor pet dander, mold spores and other micro-organisms that can aggravate allergies, asthma and respiratory conditions. These contaminants recirculate around the house, and can settle on bedding, furniture, floors, and other surfaces. Regularly sweeping and dusting these areas can help, but a professional clean is the best way to rid your home of these unwanted pollutants.
Airflow through the ducts carries with it a host of other contaminants, including dust, pollen, and bacteria, all of which circulate throughout your home. This gunk is pulled into the heating and cooling system and then blown through the house each time the furnace or air conditioner turns on. Air duct cleaning removes these irritants, and when the HVAC system turns back on, the fresh air circulating through your home means that you will be breathing in clean, healthy air.
Many companies promote air-duct cleaning as a way to improve your indoor comfort and health, and some even suggest that the practice can eliminate allergy and asthma symptoms. However, duct cleaning has not been proven to prevent these health issues, and studies show that most homeowners don’t experience noticeable improvement in their indoor comfort after having their ducts cleaned.
The biggest factor that determines if your ducts need to be cleaned is a visual inspection of the vents and registers. Look for large deposits of dust, and a musty odor. If you’ve recently completed a major renovation or new construction project, the dust and debris from that work may have settled in your ductwork and need to be removed.
If you do decide to have your ducts cleaned, make sure to schedule the appointment at a time when you can clear a path to the ductwork leading from your return and supply registers. The process involves creating negative pressure in the ductwork, and using an agitation method and vacuum collection equipment to dislodge the grit and contaminants from the walls of the ducts. It’s a good idea to arrange for pets and children to be out of the house during the cleaning, as they will likely be disturbed by the noise and activity. You should also be prepared to move items on shelves and tables in your attic or garage, as the technician will need access to these spaces in order to inspect and clean the ductwork.