Many people only associate mold growth with a home’s damp and humid locations, like the bathroom, kitchen, and crawl space. But given the right conditions, mold can also grow in your heating, cooling, and ventilation (HVAC) system.
Mold in HVAC systems is a very common issue. Spores multiply quickly in conditions with a temperature range between 40°F and 90°F. Your HVAC system and equipment provide the ideal environment for molds to grow and spread. To avoid any health issues that might result from mold buildup, you must take the required precautions.
One of the ways to protect your HVAC system is to disinfect it regularly. It is advisable to periodically check your drip pan and evaporator coils for mold growth. There are different EPA-approved disinfectants and mold inhibitors that can be applied to the HVAC system to remove and prevent future mold growth.
With my experience as an HVAC specialist, I will provide you with the best HVAC mold inhibiter solutions and options you can explore.
Let’s get started!`
Bottom Line Up Front
There are many mold-killing products on the market today. You can choose the right product based on how bad the mold is in your HVAC system. I would choose the ones that are less dangerous, like the Concrobium Mold Control and RestorOx.
Pick at a Glance
- BBJ Mold Control for HVAC Systems and Air – Great for all HVAC surfaces.
- RMR-141 Disinfectant and Cleaner – It cleans, disinfects, and deodorizes at the same time.
- Concrobium Mold Control – Safe, as it does not give off any harmful fumes or chemicals.
- Moldex Mold & Mildew Killer – A non-acid cleanser that comes in convenient ready-to-use packaging.
- Mold Armor Rapid Clean Remediation – Safe for all HVAC systems and a long list of non-porous surfaces.
- Biocide100 – Just as effective as the rest, but it also removes mold stains.
- RestorOx – Specially eco-friendly.
- Mediclean – Prevents molds just as much as to kills them.
- Decon 30 Disinfectant Cleaner – Plant-based disinfectant.
Selection Criteria
Below is how I chose the best mold inhibitions solutions on this list.
Class
There are two basic solutions for treating mold and mildew:
- Fungicide – Kills mold growth at the roots.
- Mildewstat – Prevent the regrowth of mold from spores
However, it is important to know that some products combine fungicide and mildewstat mold remover types as an all-in-one solution for mold treatment.
Strength
Checking if a product is registered with the Environmental Protection Agency is one way to find out if it works (EPA). The solution’s bottle has an EPA registration number to show that it is certified. You can also use the EPA website to look for the product.
The goal is to get rid of the mold and make sure it doesn’t come back. So I made sure to choose products that could be counted on to do the job.
Application
Removing mold from your HVAC system may be tedious, but selecting the right product can make it easier. Many mold removers come in spray bottles, with instructions on how to use them to get uniform spread, even in hard-to-reach areas.
Some products also require scrubbing and wiping after application; it is important to consider these points in choosing a mold remover solution for your HVAC system.
Why You Find Mold in HVAC Systems
Mold grows in your HVAC systems, like air conditioners, when moisture and warm temperatures are present. A warm, humid environment, along with poor ventilation, traps moisture and causes condensation leading to mold growth in air ducts.
How to Eliminate Mold in your HVAC System
This depends on the seriousness of mold growth. The EPA recommends using professional services when mold growth exceeds ten sq ft. Some homeowners manage the mold problem on their own if the growth is not too significant. It involves using commercially available solutions that remove mold and stop its growth.
If you decide to handle mold infestation in your heating ducts by yourself, you can get mold removers and inhibitors. In this article, you will find a selection of commercial mold removers and inhibitor solutions that you may want to try.
Best HVAC Mold Inhibitor Solutions
A Selection of Mold Inhibitors You Can Choose From
BBJ Mold Control for HVAC Systems and Air
This product controls mold and mildew growth on various HVAC system surfaces, including coils, pans, ducts, and outdoor systems.
BBJ Mold Control for HVAC Systems is a broad-spectrum antimicrobial agent in a ready-to-use form. You can use it to sanitize all elements of the supply and return side of HVAC systems. It will not damage or bleach contact surfaces, and one application provides months of protection.
Suitable for
All HVAC systems.
Product Certification
- EPA Registered – This shows that the product is certified to be effective by Environmental Protection Agency
- Fungistat – Stops the regrowth of fungi
- Mildewstat – Stops the regrowth of molds
Verdict
Highly effective in controlling the growth of mold, mildew, bacteria, and fungus. This product sanitizes and deodorizes, so you do not have to use multiple products. Also, it comes ready to use, with no need for mixing or measuring.
RMR-141 Disinfectant and Cleaner
RMR-141 Disinfectant and Cleaner is an excellent product to consider if you are dealing with surface molds, as it works on a variety of surfaces. It can clean, disinfect, and deodorize any surface with ammonium as its active ingredient.
This product stops mold and mildew growth and comes in spray bottles or refills. However, it requires spraying and scrubbing the affected area for effective cleaning.
The RMR-141 disinfectant is EPA approved and has proven effective against mold, mildew, bacteria, and more.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified to be effective by Environmental Protection Agency
- Fungistat – Stops the regrowth of fungi
- Mildewstat – Stops the regrowth of molds
Verdict
If you are dealing with molds on any surface of your HVAC system, then I recommend the RMR-141 disinfectant.
Concrobium Mold Control
Concrobium Mold Control solution is suitable for many surface types and HVAC systems. It doesn’t give off harmful fumes or chemicals. It requires no scrubbing or rinsing and will effectively control mold and its musty odor.
The Concrobium Mold Control solution encapsulates and kills the mold and spores so they cannot regrow. It also lays down an antimicrobial barrier over surfaces to repel new spores and keep them from taking root.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified effective by Environmental Protection Agency.
- Fungistat – Stops the regrowth of fungi.
- Mildewstat – Stops the regrowth of molds.
Verdict
The Concrobium Mold Control solution is suitable for many surface types and HVAC systems. All you need to do is spray it on and let it dry.
Moldex Mold & Mildew Killer
The Moldex Mold Killer cleans, disinfects, and deodorizes at the same time. It kills mold and bacteria that cause odors. It also prevents mold and mildew growth.
This solution is effective against a broad spectrum of bacteria and is fungicidal when used as directed. It is a non-acid cleaner and comes in an economical ready-to-use package.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified effective by Environmental Protection Agency.
- Fungistat – Stops the regrowth of fungi.
- Mildewstat – Stops the regrowth of molds.
Verdict
The Moldex Mold Killer is an all-in-one package. Just by spraying once, it kills molds and inhibits regrowth while deodorizing at the same time. It’s a good buy.
Mold Armor Rapid Clean Remediation
Mold Armor mold remover also eliminates molds and inhibits new spores’ growth. It is a mold preventative that is safe for use on HVAC and a long list of non-porous surfaces.
Mold Armor is a one-step sanitizer, disinfectant, and mold remover. Just spray it on the surface and follow the directions for wait time depending on your application use. Rinse and scrub it away.
However, it requires adequate ventilation because the fumes can be powerful.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified to be effective by Environmental Protection Agency
- Fungicide – Kills fungi
- Mildewstat – Stops the regrowth of molds
Verdict
The Mold Armor is a great buy. It is a one-step sanitizer that disinfectants and prevents molds effectively.
Biocide100
Biocide 100 kills molds, fungi, bacteria, and viruses. It is a ready-to-use solution that works well on non-porous surfaces. Also, it removes mold stains.
BioCide 100 breaks down the mold spores and eradicates them on a molecular level. This helps to eliminate disease-causing mycotoxins.
It can also be applied with a sprayer.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified to be effective by Environmental Protection Agency
- Fungicide – Kills fungi
- Mildewstat – Stops the regrowth of molds.
Verdict
The Biocide 100 is another effective way to remove molds from your HVAC systems. Not only does it kill mold, it also removes mold stains.
RestorOx
RestorOx is an eco-friendly all-in-one disinfectant. It is a fast-acting mold solution designed with the environment in mind. It promises to kill and prevent the growth of molds without harsh chemicals.
The solution is non-irritant and non-corrosive to the eyes and skin. It performs well on your HVAC components and a wide range of surfaces.
Its main ingredient is hydrogen peroxide, which also breaks down into oxygen and water, making it the eco-friendly choice.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified effective by Environmental Protection Agency.
- Fungistat – Stops the regrowth of fungi.
- Fungicide – Kills fungi.
- Mildewstat – Stops the regrowth of molds.
Verdict
The RestorOx kills mold and stops it from growing in a way that is safe for the environment.
Mediclean
Mediclean is an antimicrobial promising broad-spectrum effectiveness in killing molds and preventing future growth. This disinfectant spray is suitable for use on both porous and non-porous surfaces.
It is an effective deodorizer against the smell of molds.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified effective by Environmental Protection Agency.
- Fungistat – Stops the regrowth of fungi.
- Fungicide – Kills fungi.
- Mildewstat – Stops the regrowth of molds.
Verdict
The Mediclean deodorizes as effectively as it kills mold.
Decon 30 Disinfectant Cleaner
If you want a more natural approach to killing and removing molds without using strong chemicals, Decon 30 may be the product for you.
Decon30 is a plant-based botanical disinfectant with no strong chemicals and doesn’t give off fumes, so you don’t need protective gear.
It is a gentle formula with no bleach or dyes and requires no rinsing after application.
Suitable for
All HVAC systems.
Product certification
- EPA Registered – This shows that the product is certified effective by Environmental Protection Agency.
- Fungistat – Stops the regrowth of fungi.
- Fungicide – Kills fungi.
- Mildewstat – Stops the regrowth of molds.
Verdict
The Decon30 is a perfect option if you are looking for a more natural way to get rid of mold in your HVAC systems.
How Do You Locate Mold in Your HVAC Systems
Molds give off a musty wet odor when it accumulates, so if you smell such an odor from your air ducts, you probably have mold in one or more components of your HVAC system.
The four major components of concern are:
- Drain pan – Your HVAC system pulls moisture from the air and condenses it into water. This water collects in a drain pan for disposal. Dirt and dust may block the drain pan and promote mold growth.
- The drain line – Water from the drain pan flows through the drain line to empty it outdoors. When drain pipes are blocked, it stops the condensate from flowing. An unflushed drain line increases the growth of mold.
- Evaporator coil – Your HVAC system pulls heat and moisture from indoor air. It can accumulate condensation and dust. The combination of heat, moisture, and dust can provide an ideal condition for mold growth.
- Air ducts – Old, unsealed, or air ducts with broken seals may allow moisture through gaps in them. Mold spores in the air, in addition to moisture and heat, may promote the growth of mold colonies in the air ducts.
How to Apply Mold Inhibitor to Your HVAC System
Now that you know where to look for mold in your HVAC system, selecting the best cleaning solution that meets your requirement is next. It is important and can decide the success of your mold removal task. The selected cleaning product can remove the mold and stop it from growing back or let it multiply secretly.
I advise using masks, thick rubber gloves, coveralls, and safety goggles. This protects you from the mold, mold spores, and chemicals in your cleaning solutions.
Here are a few steps to cleaning your system.
- Select a suitable mold removal agent that is EPA certified and meets your requirement. You can choose and purchase one from my suggested list of products.
- Remember to wear protective clothing to safeguard yourself from both chemicals and molds. EPA recommends wearing thick rubber gloves, protective goggles, coveralls, and N95 masks when cleaning the mold.
- Switch off your HVAC system at the mains, and access the cooling and heating unit, air ducts, drip pan, evaporator coil, or wherever the mold growth is visible.
- Spray your mold disinfectant on the affected area using a spray bottle or can. Move the hose to get an even spread if you use a fogger machine. Allow the solution to set for a few minutes (check the manufacturer’s direction of use).
- Start scrubbing with a light brush or rag using a circular cleaning motion, depending on your chosen mold inhibitor.
- Wipe away any excess solution. That’s it!
Conditions that Allow Mold to Grow
- Moisture – Molds grow and multiply very fastest in humid and wet conditions. This makes mold growth a big concern in homes with excess humidity or water leaks.
- Food source – Molds digest many kinds of organic matter and can feed on such things as soap or organic matter in the dust.
- Oxygen – Molds are organisms that need oxygen to survive but can grow even when oxygen levels are quite low.
- Temperature – Many types of mold have different temperature preferences, but most can grow in an environment between 40°F and 90°F.
Frequently Asked Question
Question: How long does mold grow in the HVAC system?
Answer: It only takes about 48 hours for mold to grow once it begins to accumulate. Once it starts to develop, the germs from the mold will spread throughout the rest of the house as the air moves through.
Question: What temperature should I set my air conditioner to prevent mold?
Answer: You can avoid mold development by maintaining a temperature in your home between 68 and 74 degrees Fahrenheit and a humidity level between 30 and 60%.
Question: What kills mold in HVAC?
Answer: To remove mold, mildew, and other debris from non-porous surfaces like ductwork, coils, plenums, pans, etc., use a disinfectant registered with the EPA and specifically designated for use in your HVAC. Fortunately, the links to EPA-approved items I’ve included in this piece are EPA-registered.
Question: What does mold in the HVAC smell like?
Answer: It smells musty and earthy, like rotting leaves or dirt.
Question: How do you check for mold in HVAC?
Answer: Mold in your vents can be different colors, such as black, green, brown, and yellow. So, if you see this kind of growth in your vents, it’s probably mold. Mold spores could get out of your ducts and be spread all over your home by the air that moves through them.
The Bottom Line
Mold needs to be taken care of as soon as they appear. You could help ensure it doesn’t come back by keeping an eye on the inside of your HVAC system. If mold keeps coming back because of a leak or too much moisture, you should have a professional look at your HVAC system.
With little effort, you can control mold and mildew growth using commercial mold inhibitors in your HVAC system. Remember to look out for products with EPA approval. Follow the manufacturer’s instructions while applying them to all components of your unit, and always wear protective apparel.
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