Getting Rid Of Mold In Your HVAC System

Tori Klein • October 12, 2023

When the air in your HVAC system is tainted by a musty odor, you're likely dealing with an unwelcome guest – mold. Ensuring clean, fresh air in your spaces is not just about comfort; it's a health imperative.


HVAC systems have become vital in most commercial and residential buildings, especially in places with varied climates like Washington County and surrounding areas. These systems work tirelessly, ensuring comfort regardless of the temperature outside. As experts in HVAC services, Best Owner Direct has encountered and addressed mold issues in numerous establishments.

Picture of a woman sitting with a worried look on her face.

Why does mold grow in HVAC Systems like Air Conditioners?

Mold, a type of fungus, thrives in damp, dark, and humid environments– prevalent within many parts of an air conditioner. Let's explore the primary factors leading to mold growth:


  • Condensation: As your AC unit works, it cools down warm air, leading to condensation. While most of this moisture is channeled out, sometimes, due to blockages or other issues, water accumulates, providing a ripe environment for mold.
  • Inadequate Ventilation: When airflow is restricted due to clogged filters or other obstructions, it can lead to moisture retention, especially in the evaporator coils.
  • Location Factors: Units in basements or other damp areas of a building are more susceptible, given the higher ambient moisture.
  • Irregular Maintenance: A lack of regular cleaning and servicing means that dust, dirt, and other organic materials can accumulate, feeding and sheltering spore growth.
  • Drain Pan & Line Issues: If the drain pan is not sloped correctly, or if the line is blocked, it can result in stagnant water, again a hotbed for mold development.


Why is mold such a health concern?

Beyond the unsightly appearance and unpleasant odors, mold poses genuine health risks, particularly in systems designed to circulate air throughout our spaces.


  • Allergic Reactions: Many individuals are allergic to mold. Symptoms can range from sneezing, rashes, and watery eyes to more severe respiratory issues, especially in asthma sufferers.
  • Mycotoxins: Certain mold types release mycotoxins, leading to neurological problems and, in severe cases, even death.
  • Respiratory Ailments: Continuous exposure to mold can result in throat irritation, coughing, and wheezing, making it particularly concerning for those with existing respiratory conditions.
  • Spread & Proliferation: As the AC circulates air, it can also spread mold spores throughout the building, amplifying the potential health concerns.
  • Compromised Immune Systems: Those with weakened immune systems, like the elderly or those undergoing certain medical treatments, can be especially vulnerable to mold exposure.


How to prevent mold?

Prevention is always better than cure. Taking proactive measures can help prevent mold growth, ensuring the air in your space remains clean and healthy:


  • Regular Maintenance: Schedule professional maintenance with experts like Best Owner Direct. Regular check-ups ensure that all parts of the AC, especially those prone to mold, remain clean and function correctly.
  • Optimal Thermostat Settings: Maintain a consistent indoor temperature, ideally between 68°F and 72°F, to reduce humidity levels.
  • Use a Dehumidifier: Especially during humid seasons, using a dehumidifier can help maintain optimal indoor moisture levels, discouraging mold growth.
  • Ensure Proper Drainage: Check the drain pans and lines regularly to ensure they're blockage-free, allowing condensate to flow out and preventing water accumulation.
  • UV Light Installation: Some advanced systems come with UV light installations that kill mold spores and bacteria, keeping the air clean.


When to call a professional

Recognizing when it's time to seek professional help is key to ensuring your HVAC system's longevity and indoor air quality. Here's when you should consider calling in the experts:


  • Extensive Mold Growth: If the mold issue isn't just a small spot but seems widespread throughout the system, it's best to consult professionals.
  • Recurring Mold Issues: If you've cleaned mold from your system before, but it keeps returning, it indicates a more significant underlying problem that a professional can address.
  • Health Symptoms: If inhabitants are experiencing health issues like persistent coughs, sneezing, or respiratory problems, it's time to get an expert's opinion.
  • Lack of Proper Tools: Cleaning mold requires specific equipment, especially within the ductwork. Professionals have the tools to do the job efficiently and safely.
  • System Performance Issues: If, in addition to mold, your AC system isn't cooling effectively, is making strange noises, or has an unexplained spike in energy bills, a professional can address both the mold and the system's operational concerns.


At Best Owner Direct, we prioritize your health and comfort. Our team is equipped to handle mold in HVAC systems with efficiency, ensuring you breathe clean, healthy air.

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Best Owner Direct is your local, independent, family-owned and operated, residential and commercial HVAC service, repair and installation team. We're a trade ally of the Energy Trust of Oregon and our certified professionals offer services for all major brands. With over 20 years of experience, our team can handle all of your HVAC needs.


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