Duct Cleaning Services: How Dirty is Your HVAC System?

Shawn Folks • April 6, 2022

The HVAC system in your home and business is critical to the comfort and health of your family and employees. The accumulation of dust and dirt, along with the development of mold can cause serious respiratory health issues, as well as increase the wear and tear on your HVAC system. Mold can quickly and easily gain entry into the ducts that move the air through your HVAC, compromising the air quality, and allowing spores to spread through your home or office. Let’s take a closer look at what mold can do and how to address dirt, dust, and fungus in your heating, ventilation, and air conditioning systems.


What Types of Mold and Bacteria Can Infiltrate Your HVAC System?

There are many different types of mold that can grow in air ducts. The most common include Alternaria, a dark green or brown mold that spreads quickly. There is also Acremonium that can present itself in several colors and has a powdery appearance. Stachybotrys, or black mold, is a toxic species of mold that can cause nose bleeds, headaches, coughing, and fever. If you’ve experienced watery eyes, sneezing fits, or respiratory issues, or have noticed a dank odor while the HVAC system is running, you may have mold in your ducts.


How Do You Know if Your HVAC System is Dirty?


There are several things that you can check to determine if the time has come to have your HVAC system and its ducts cleaned. Not only can noticing these signs help your system to perform at its best, but it can enhance the overall air quality in your space. Check for dirty vent covers, any dirt or debris that accumulates on these means that your ducts need to be cleaned. Inconsistent air flow is another symptom of dirty ductwork. Dust, dirt, mold, or other things could be obstructing the ventilation. 


When is the last time that you changed your air filter? If it’s been a while, dust and dirt could be built up in the ducts due to an old, clogged filter. Higher than normal utility bills can also point to your HVAC system working inefficiently due to being dirty. Lastly, if you notice mold from a leaky roof, plumbing, or other source of humidity on walls, ceilings or other places, its likely that it is in your ductwork as well and needs to be remediated as soon as possible.


Can You Prevent Mold from Developing in Your HVAC System?


While mold is a common occurrence in the humid, tropical climate of the gulf south, there are steps that you can take to mitigate the risk of it infiltrating your HVAC and ductwork. Begin by maintaining a dry environment in your home or office. Mold grows well and spreads in damp areas, so be sure to repair any leaks as soon as possible. Having your ducts professionally cleaned and sanitized on an annual basis is also effective in preventing mold growth. Performing other routine maintenance of your HVAC system, like changing air filters each month and checking its performance can help you to minimize the likelihood of mold and other dirt and debris buildup in your ventilation systems.


The professional mold remediation and HVAC cleaning experts at Guarantee Restoration can help to eradicate mold, dirt, and dust in your residential and commercial buildings. These services will restore the health, safety, and comfort of the air in your home and business.

By Christina Mullins July 9, 2025
Saying Hi to July! The summer is here—and so is the 2025 Atlantic Hurricane Season. No matter what it brings, you can be assured that our team at Guarantee Restoration Services will be there when you need us most. Meet the Team: Marcela Argueta Every month, I have the opportunity to showcase our many awesome team members. For July, we are shining the spotlight on Marcela Argueta , who serves as a Lead Technician at our New Orleans location. She was promoted to that position in January 2025 . From Honduras to GRS Marcela was born and raised in La Ceiba, Honduras , also known as “la novia de Honduras” —which translates to “the bride of Honduras.” She moved to the U.S. in December 2016 after earning her bachelor’s degree in nursing from the Universidad Nacional Autónoma de Honduras . Marcela is currently approved and ready to take her exam to become a registered nurse in the U.S. Before joining our team in August 2022 , she worked as both a nurse and a homemaker . Life Outside of Work Marcela is a proud mother of two—her son, Sebastian (15) and daughter, Eleanor (5) . When she’s not working, she loves spending quality time with her children and extended family. Fun fact: her half-sister, Brenda , also works at GRS in our Baton Rouge office! One of Marcela’s favorite pastimes is going for walks in the park. She says she often uses this time to meditate and reflect—thinking about what she’s done well and what she could improve.
Property Damage after Storm
By Barrett Dick July 2, 2025
Recovering from storm, fire, or flood damage takes more than just cleanup. Learn how full property reconstruction restores structures, systems, and interiors for long-term protection and complete recovery.
Why Water Restoration Services Are Important for Businesses in Mobile
By Erik Seagrave June 25, 2025
Mobile, Alabama's location on the Gulf Coast makes it especially vulnerable to water damage. With heavy rainfall, high humidity, frequent storms, and proximity to Mobile Bay, flooding and moisture-related damage are constant concerns for businesses and commercial properties.
VIEW ALL BLOGS