By: Patricia Cermignano

Mold is a natural part of the environment. When found outdoors, mold plays an important role in nature by helping break down dead organic matter such as fallen leaves and dead trees. However, when mold is found indoors, it should be avoided at all costs.

Mold reproduces by means of tiny spores that are invisible to the naked eye and float through the air. Once mold spores travel into the indoor air and land on a wet surface, mold will begin to grow. While there are many different types of mold, all of them require water or moisture to grow. The three most common types of mold found indoors are:

  • Aspergillus: Commonly found on food and living in air conditioning systems.
  • Cladosporium: Non-toxic black or green substance that commonly grows on the back of toilets, painted surfaces or fiberglass air ducts.
  • Stachybotrys Atra: Commonly known as black mold.

How does mold grow indoors? When humid air passes over chilled cooling coils, water condenses and drops through the coils into a collection pan which continually drains. A problem occurs when the water becomes blocked on the coils or in the drip pan, resulting in stagnant water. When the coils or pan begin to grow mold, your home can become infected very quickly with dangerous mold spores.

Three ways to prevent mold growth in your home are as follows:

  1. Be sure to clean off all hard surfaces of any water or detergent until the surface is completely dry.
  2. Reduce any potential condensation on cold surfaces by adding insulation to windows, piping, exterior walls, roof or floors.
  3. Avoid placing carpets in areas where there is a particular moisture source.

Typically, mold is not an issue in your home's HVAC system if it is maintained on a regular basis. However, three ways to help prevent mold growth in your HVAC system are as follows:

  1. Make sure you sign up for preventative maintenance on your HVAC system twice a year to ensure that the pan under the indoor coil stays clean and is not blocked.
  2. Install a UV Light next to the cooling coils to help eliminate any mold or bacteria growing on the coils or the collection pan.
  3. Keep your ductwork clean and use a high-efficiency filtration system to keep your entire HVAC system clean.

For any questions on how to eliminate or prevent mold growth in your home and HVAC system, please contact our office at 610-642-6323 or visit our website at