Can dirty furnace ducts make you sick?

Author: Carol Bauch  |  Last update: Thursday, April 17, 2025

Dirty air ducts can cause a number of health problems, including allergies, asthma, and even respiratory infections.

How do you know if your air ducts are making you sick?

If your family is getting sick more than normal, experiencing coughing, sneezing, sore throats, runny noses, nasal congestion, headaches, and low-grade fevers, they may have upper respiratory infections as a result of dirty air ducts.

Are dirty air ducts a health hazard?

Risk 2: Health Issues

Clogged air ducts can spread dirt, allergens, pet dander, and debris particles throughout your home, aggravating your allergies and lungs. This irritation can cause increased sneezing, coughing, watering eyes, and even increased asthma symptoms.

Can a dirty furnace make you sick?

Allowing your HVAC system go to the wayside can create a dirty environment that leads to nasal congestion, dust and dust mites, allergies, and bacteria and viruses to name a few.

What happens if air ducts are not cleaned?

Decreased Air Quality

Your ducts attract and trap dirt, allergens, and pollutants. Once the ducts are clogged with those particles, your air will no longer be clean, which means you and your family will breathe in more of the contaminants. If you have dirty filters, the problem will be exacerbated.

Can furnaces make you sick?

How to tell if air ducts need cleaning?

If you see dust and dirt both inside and outside — especially by the vents that blow cool air out — your ducts most likely need to be cleaned. To prevent future dust buildup, make sure you replace your HVAC system air filters frequently. You can also run an air purifier.

What are the symptoms of dirty air?

Breathing polluted air over time can cause symptoms such as headaches, a sore throat, sneezing, and congestion. Be aware that these symptoms could be a sign of dirty indoor air. If you or a family member is experiencing these symptoms, there are a few simple things you can do to improve your home's air quality.

How do I know if my furnace is making me sick?

Symptoms of Heater Sickness

Here are a few common symptoms to keep an eye out for: Coughing and sneezing. Sinus infections. Allergy symptoms.

Is duct cleaning a waste of money?

Dust and other debris accumulates in ductwork over time, and duct cleaning is beneficial and even necessary under some circumstances. However, duct cleaning might be inconsequential when there is no severe duct system issue, according to the Environmental Protection Agency.

Can sleeping under an air vent make you sick?

Many AC units and ducts are high in humidity, as they trap moisture in the air and don't release it. Mold spores can grow inside your ducts, and your system can spread them into the air. They can also grow on your filters or in your vents. Breathing in mold can spark an asthma attack.

How much does it cost to clean your air ducts?

According to the Environmental Protection Agency, the average cost for properly cleaning an entire air duct system in an average-sized home ranges from $450 to $1,000.

Can dirty air ducts cause sinus problems?

They Cause Sinus Problems

Symptoms include coughing, congestion, weakness, fatigue, and fever. If you have sinusitis or a family member that has it, clean your air ducts as it could potentially reduce the problem.

Can I clean my ducts myself?

Use a brush to loosen any buildup of dust in the ductwork. Lift register and insert vacuum hose as far into the piping as it can go. Turn the vacuum on to capture as much dust as possible that the fan is pushing through the ductwork.

How do I know if the air in my house is making me sick?

Signs of poor indoor air quality may include excessive amounts of dust or increased difficulty breathing in your home. People with allergies or other breathing problems will often be some of the first to experience the effects of poor indoor air quality. Sometimes you might even smell the problem before you can see it.

Does cleaning air ducts really make a difference?

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. This is because much of the dirt in air ducts adheres to duct surfaces and does not necessarily enter the living space.

Can a dirty furnace filter make you sick?

Air Becomes Stagnant: When filters get clogged, air doesn't move. This leads to stagnation of the same air throughout your house. Dust, moisture, odors, and other particles also will stagnate and can often cause allergies.

How often should ducts be cleaned?

Experts advise having your air ducts cleaned every 2 to 3 years to prevent many maintenance and health problems before they start. However, homes with pets or children with allergies should have their air ducts professionally cleaned more frequently than the recommended average.

How much does Stanley Steemer charge to clean air ducts?

While it may seem like a money-saving deal, the final price tag will probably be closer to that $450-$1000 range. Also, keep an eye out for scams where the price doesn't change once the technicians arrive at your home, but they don't clean all of your ductwork.

What are the drawbacks of duct cleaning?

Cons:
  • It's Not a Permanent Solution: Air duct cleaning is not a permanent solution to the problems in your ductwork. ...
  • It Can Be Expensive: Air duct cleaning can be expensive, especially if you have a large home with multiple ductwork systems. ...
  • It's a Mess: Air duct cleaning can be a messy process.

Can a dirty furnace cause sickness?

Respiratory Infections: When Your HVAC Unit Hosts Unwanted Guests. Dirty air ducts can foster the growth of harmful microorganisms, including bacteria and viruses. When these pathogens are blown into your living spaces, they can increase the risk of respiratory infections.

What are signs of carbon monoxide on a furnace?

Signs That Carbon Monoxide Could Be Accumulating
  • Pilot light frequently blows out.
  • Brown or yellow stains appear around the appliance.
  • Smell of gas or exhaust.
  • Fallen soot accumulating in the fireplace.
  • Stale or stuffy air.
  • Smell of something burning.
  • Excessive condensation on windows around the furnace.

Why does my central heating make me feel sick?

While in use, heaters lower humidity levels in your home and force hot air through dusty, dirty vents, filters and ducts, if poorly maintained. Constantly breathing extremely warm, dry air that may contain fungi, mold and mildew from the vents can affect your skin, nose, throat and eyes.

Can dirty ductwork make you sick?

Dirty air ducts can cause a number of health problems, including allergies, asthma, and even respiratory infections. Dust, dirt, and other allergens can build up in your air ducts over time and eventually be released into the air that you breathe.

What are three diseases that spread through dirty air?

The combined effects of ambient air pollution and household air pollution are associated with 6.7 million premature deaths annually. Household air pollution exposure leads to noncommunicable diseases including stroke, ischaemic heart disease, chronic obstructive pulmonary disease (COPD) and lung cancer.

How do I know if my ductwork needs to be cleaned?

How to Tell if Your Air Ducts Need Cleaning
  1. Spikes in Your Energy Bill. Are you noticing an increase in your energy bill, but there's no explanation for the spike? ...
  2. Dirt or Dust Around the Vents and Registers. ...
  3. Mold. ...
  4. Your Facility Was Just Built or Has Undergone a Major Renovation. ...
  5. No Record of Prior Duct Cleaning.

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