Forever Green Air LLC

The Most Experienced Cleaning Company.


Air Duct Mold Cleaning Houston, TX

HVAC Cleaning For Houston, TX

Do mold spores frighten you when you see them growing on your registers or filters? It should. Mold spores could be in your AC system if you see them on your registers Mold spores are like pollen spores – they float in the air. Air circulation from powerful air conditioning systems sucks those spores into the air returns, over the AC coils and out through the ceiling registers. That’s when you see that dark growth on the ceiling registers its time to get the system professionally cleaned and sanitized. If you simply wipe it off then the underlying cause will make it return. Most problems with mold result in the need for HVAC cleaning and sanitizing. 

Underlying Causes of Moldy Ducts

Mold grows with a water source and food such as cellulose or paper. Most soft wood trim and drywall is an ideal food source. It only need water. Mold spores can also grow on metal AC registers and in plastic or foil based ductwork. The spores are ‘sticky’ and adhere to these surfaces if there is a regular temperature change.

Negative Air

A negative air HEPA vac’ machine pulls air into the machine in large quantities and over a HEPA filter which removes the spores. It’s like a large fan in reverse. The cleaned air is expelled out of the home using plastic tubes. The contaminated HEPA filters are removed from the home in sealed containers. These compact machines remove mold spores from the air and prevent circulation of the spores to other areas. With open plan homes nowadays its difficult to limit the spread of spores before professional containment is set up. These machines are essential weapon when air is already contaminated with spores. 

How Do You Know Air Is Already Contaminated

If you can see mold on surfaces and it’s been over two days then the mold body, the mycelium has already spread their spores. If you get headaches, dry mouth, or your allergies flare up abnormally inside your home than it’s likely that mold spores are to blame. If you can see the mold, then we can treat it and kill it. If you can’t see it, then you need to have an air test by a licensed mold hygienist*. HVAC is subject to hot and cold temperatures when you override the constant temperature setting to save money by turning the system off during the day if you are away and on at night in Texas to cool off. In Houston, we have high humidity and humidity means the percentage of water vapor in the air.  


Temperature change creates condensation. Put a glass of iced water on the table and see the water vapor condense out and drip. Humidity is enough of a water source for spores to grow. Spores are naturally occurring both outside and inside the home and being brought in from contaminated water like toilet overflows, sewer backups, or flood. 


If you keep HVAC temperature too cold, then that too can start condensation and as the cold air meets the warm air around windows and outside doors. Mold can also grow from seasonal changes. It’s best to consider having your HVAC system ductwork clean and sanitized every few years as a preventative measure and keeping the system at a constant temperature. There is a minor point in having an HVAC cleaning and sanitization while active mold remains in the property. The mold must be treated and killed first on all affected surfaces before we clean the HVAC system.  


Our HVAC duct cleaning machines are manned by two experienced experts who follow a set process.  Before we start work, we will require access to the property for about 4 hours without pets and children in the home. 

What You Can Expect

1) Containments are built as needed around registers and air returns and over personal property.

2)Filters are removed, bagged and discarded. You must have replacement filters of the right size on site ready for our tech’s to install after the cleaning. 
3)Each register is removed, numbered and cleaned.
4)The technician uses the HVAC RotoBrush machine to clean each register housing and the ductwork using a soft spinning brush at the end of a vacuum hose that sucks dust and spores out of the ducts. 
5) Then the technician opens the AC unit to expose the coils and housing for cleaning. We cannot go beyond the coils for fear of damage to old wiring.  
6)When cleaning is completed the system is turned on and we spray in an anti-microbial that kills remaining spores. It’s best to vacate the property for this treatment. You may find some dust and hairs are expelled from the AC fan that we couldn’t access. This is a good sign showing the treatment is killing and expelling remaining sticky spores.

How Much Can an HVAC Cost?

We base the cost on the registers and furnaces, etc that you have. It isn’t cheap, but then you are getting an expert treatment, not just a superficial dust cleaning. You can expect to pay for the technician’s expertise, specialist equipment, and distance. If our technicians see other issues like broken ducts or plenums, they will let you know.   

What Is Mold? ​

Mold is an organism that is present is most places, outdoors and indoors. It is a fungus that works to break down dead material and return nutrients to the environment. Mold grows by digesting plant or animal matter, such as leaves, wood, paper, dirt, and food, and spreads by releasing tiny, lightweight spores that travel through the air. Mold grows quickly in moist gloomy spaces, such as basements, attics, and wet building materials.


All of us exposed to some mold every day with no deleterious effects. We may breathe in mold spores present in the air or eat foods in which mold has grown. People with mold allergies, however, may have a reaction if exposed to too much of the fungus.

Symptoms of a mild allergy are those typical of many other allergies. They can include:

  • Wheezing
  • Stuffy or runny nose
  • Itchy, watery eyes
  • Rash or hives
  • Development of childhood asthma, COPD, & developmental disorders in exposed children

If you have a significant proven mold allergy, avoiding all exposure to mold may not be possible. However, you can reduce your risk of reaction by controlling the environment you live and work in.

Mold Treatment & Removal

Moisture Control

The key to preventing this fungus in your home or business is to control moisture levels, especially in moist areas, such as on bathroom tiles, near sinks, basements, or crawl spaces and areas around windows. Monitor for water leaks, water stains, and water activity, upon discovery, call us for inspection.


Mold Removal & Remediation

We use your mold testing report to help create a scientific solution to your problem. Our mold inspections comprise technology that will help understand your mold problem. With over two decades of experience, we know the best solution! After inspection and a detailed review of our proposed mold solution, we will implement a mold removal plan with certified mold professionals. RECG guarantees your satisfaction and mold remediation for permanent, transferable warranties.


Why We Are The Best

  1. We are the complete solution; we stop the water, complete the remediation, and restore the property to maintain a mold-free environment.
  2. Over 20 years of the specific commercial and residential experience of all facets of mold remediation.
  3. Proven track record of on-time and on-budget completion.
  4. A large resource of equipment and labor to get the job done right and efficiently.
  5. Insured, Bonded, and Verified Staff for every facet of the project.
  6. A+ BBB Rating. Our staff is the highest trained and certified in our industry. We ensure it completely satisfies every client, a customer referral is our best compliment.


How to Sanitize Ductwork


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