Symptoms of Mold in a Heating System


The only way to know for sure if you have a mold problem in your heating system is to have a professional examine the system's internal components. But there are a few symptoms that can let you know that a problem is brewing. If you do find mold, deal with it immediately. A heating system circulates air, so mold spores may spread all over your home if you don't have the system professionally cleaned.

Signs of Water

  • Mold requires moisture to grow. So if your heating system has been wet for a while, chances are that mold has begun to develop. Look for staining and water damage around ductwork, and check the insides of the ductwork for puddles and condensation. If you see water, fix the source of the leak immediately.


  • If someone in your family is experiencing symptoms of mold exposure, but you can't see mold anywhere in your home, it may be in your heating system. The New York State Department of Health warns people to look out for the following symptoms: throat irritation, headache, cough, breathing problems (wheezing and difficulty breathing), nasal and sinus congestion, skin rash and eye irritation. Your doctor can help you determine if mold is a possibility by administering a mold-allergy test.

Mold Growth

  • If there is visible mold growth on your heating system or its metal ductwork, the U.S. Environmental Protection Agency (EPA) recommends that you have a professional take a look at it. For example, if you see a thick growth of what appears to be mold in the metal ducts or on the air registers, there is a good chance your entire system is infected with mold. The EPA says the only way to know for sure if the substance is mold is to have a laboratory examine it under a microscope. The EPA says some microbiology labs offer the test for around $50, as of 2010.


  • If you smell a musty odor, you may have a mold problem. Try to determine the source of the smell. If you notice that it gets worse the closer you are to the air ducts and vents, or if the musty smell is more powerful when the heating system is circulating air, have a professional check out your system.

Related Searches


Promoted By Zergnet



You May Also Like

  • How to Kill Mold in Ductwork

    Mold in the ductwork in your home can be a serious problem that requires your attention right away. If you or someone...

  • How to Detect Mold in the Air

    If you have mold in the air that circulates in your home, it can cause a plethora of serious health problems, including...

  • How to Kill Mold in Heating Vents

    Mold is a potentially harmful and unsightly problem that is a common headache for homeowners. Mold thrives in dark, damp places and...

  • How to Remove Mold From Air Ducts

    Mold in your air ducts is a systematic problem of moisture and a permanent inability to dry out. The odors and irritation...

  • How to Remove Mold From HVAC Ducts

    The duct work of a house is how the air from the heating and air conditioning system is transferred throughout the building....

  • Treatments for Air Duct Mold

    Mold has become a great concern in home environments, as more cases are being reported by residents of structures that reveal previously...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!