Air ducts can become dirty over time, collecting dust and other debris. Duct cleaning removes this build-up, helping the home’s occupants breathe easier.
Ask potential service providers to demonstrate any visible evidence of mold or other biological contamination. Only an expert can positively identify growth, and laboratory confirmation may be required.
How Do Ducts Get Dirty?
Air ducts route air from heating, ventilation and air conditioning systems to various points inside the home. They have two different types: return and supply ducts. Return ducts take air from the room back to the HVAC system, while supply ducts transport conditioned air from the furnace and boiler into the room. If your house seems dustier than usual, it’s possible that dirty ducts are to blame.
Ducts can become dirty from dust, pet dander and mold, as well as a lack of regular HVAC maintenance. Dirty ducts can also be the result of construction or renovation work that produces a lot of dust in your home. In some cases, the ducts can be sealed off to prevent dust and debris from entering your home until the construction is complete.
Cleaning your ducts can help remove these pollutants from the air. However, cleaning ducts is a complicated process that requires specialized equipment and knowledge of HVAC systems. It’s best to leave this task to a professional.
Some studies suggest that duct cleaning can improve energy efficiency in homes with dirty air ducts. However, it’s important to note that a clean filter and proper HVAC maintenance are more effective at improving energy efficiency than cleaning the air ducts alone. It’s also not clear whether or not duct cleaning can reduce the risk of allergies, asthma or other health problems.
What Are the Signs of Dirty Ducts?
Many signs can indicate your home’s ductwork is in need of a cleaning. Dust accumulation around vents and air return covers, noticeable changes in airflow from room to room, and visible mold growth are all indicators that a thorough cleaning of the duct system is in order.
Inconsistent indoor temperatures are another common sign of dirty ducts. The ducts struggle to distribute conditioned air evenly, and this can lead to hot or cold spots throughout the house. Often, these problems can be resolved with simple maintenance or a professional cleaning.
You should also keep in mind that a clean duct system can improve your family’s overall health. Dirty ducts can be a breeding ground for dust mites, bacteria, and other allergens. Breathing in these contaminants can trigger asthma and other respiratory problems, especially in sensitive family members.
If you suspect your ducts need a cleaning, it’s important to find an experienced service provider who can provide you with knowledgeable answers to your questions and complete a thorough inspection. Insist that the company will use well-controlled vacuum equipment to remove dust from duct surfaces and return air registers. Ask whether the company will seal and re-insulate all duct access points, and find out whether they will use a low-toxicity biocide to control mold growth. If they do, request that it be applied only to uninsulated areas of the ductwork, and insist that it will be used strictly according to label directions.
Can I Clean My Ducts on My Own?
Air ducts are long and complex, and they often have nooks and crannies that are hard to reach with a vacuum cleaner hose attachment. Cleaning a duct requires removing and unscrewing the vent cover, then using a brush to clean along the duct walls and reaching as far inside as possible. Afterward, vacuum up the dust and dirt with a shop vac. You can also use a brush with a long handle for harder-to-reach areas.
It is important to use protective gear when working with ducts, including eye protection and a dust mask. You will also need a screwdriver to remove the vent covers, and a brush with a long handle to reach into nooks and crannies of ducting. A shop vacuum with a hose attachment will be useful for vacuuming ducts, as well.
Duct cleaning services may attempt to persuade you that your ducts are infected with biological growth by displaying visible microorganisms on a petri dish. However, such microscopic organisms are common and not necessarily indicative of the presence of harmful pathogens in your ductwork.
Some duct cleaning services propose to introduce chemical biocides or ozone into your ductwork to kill bacteria (germs) and mold and prevent future biological growth. There is considerable controversy about the need for such chemical interventions and their safety, particularly in the case of ozone.
Can I Hire a Professional to Clean My Ducts?
Air ducts that are too dirty can contribute to major health issues, especially for people with respiratory conditions like asthma, auto-immune disorders, and allergies. Dirty ducts can aggravate these conditions and cause symptoms such as irritated eyes, nose or throat, headaches, and fatigue.
A reputable air duct cleaning company will adhere to nationally recognized standards for quality. They will also use specialized tools to remove dust, mold, and dirt from the inside of your vents. Look for a company that offers clear, upfront pricing before you book their services. Be wary of companies that advertise extremely low prices, as this may be bait-and-switch advertising.
Prior to your technician’s arrival, make sure you tidy up so they have easy access to all of your vents and your air handler and plenum (the box that houses your furnace). It helps if you also move any items that are in the way of their work or may get damaged by their equipment, like furniture, toys or decorative pieces. It is a good idea to show your technician all the rooms of your home and point out vents.
Some companies offer additional services, such as applying chemical biocides or sealants to ducts or other system components to prevent future buildup of harmful substances. While these methods may have some benefits, they are not proven to be effective. If your company proposes these additional procedures, ask whether they are recommended by the EPA or NADCA.