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Air Conditioning Mold Advice News Blog Questions and Answers

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March 17, 2012. I live in the Bahamas and am having terrible health issues in my house from what I believe is mold in my a/c.  We have two units, one in the bedroom and one in the living areas.  The living areas tested high for penicillium mold, the a/c smells awful, so bad that I can hardly stand to have it on.  Myself and my kids are suffering with constant nasal and respiratory problems. The problem is no one seems to be able to locate any mold and I know that's what it is.  I've had the handler cleaned but maybe the guy just isn't qualified to deal with this situation.  I'm at the point where I want to replace everything including ducts if I have to.  We have the soft ducts so I don't think it's possible to clean them.  I'm told by several persons who inspected that there is no visible mold in the attic. What would you suggest we do?  If we buy another unit will that just get contaminated too? Any advice you can give would be appreciated.
A.  The high humidity in the Bahamas is the most like cause of the moldy air con units. In addition, air con equipment and ducts are fertile grounds for mold infestation growth because of the naturally wet environment inside the equipment and ducts.  You should yourself using your good sense of smell, good eyes, and a strong flashlight inspect inside the attic to see if there are ANY roof leaks because a roof leak will result in hidden mold growth in your home's ceilings, walls, and air con equipment and ducts.  You should also check all of your plumbing for any possible plumbing leaks.  Don't replace your air system---instead fix the mold problem.  Since you have mold-infested air conditioning, you will also have mold cross contamination everywhere inside your home because the air con air flow will be continually distributing airborne mold spores to land everywhere in your home and on its possessions. Your first step should be the sign up for my 60 days of unlimited email mold advice for only $99 at  Your second step should be to order one home unit Bio3Blaster high ozone generator to do heavy ozone treatment inside your air con equipment, attic, and in all other areas of your house. Repeat the ozone treatment of the air equipment and ducts every three months. The plug is American style and generator is 110 V, and I don't know the plug type and voltage in the Bahamas. You might need to use a plug adapter and to use a step down transformer 220 v to 100 volt if the Bahamas uses 220 volt rather than the 110 volt used in USA and by the ozone generator.   Read about ozone treatment and the ozone generator at  Be sure to read the use and safety instructions accessed from a link from that page. Be sure to watch all of the YouTube ozone video links on the above page. Your third step should be to use boric acid powder mixed in hot water to dissolve it to scrub down all ceilings, walls, floors and furnishings to get rid of landed/deposited mold spores. Your fourth step should be to use a mold fogging with boric acid powder.  Buy the Hurricane model fogger (affordable and great fogger) from You can buy boric at  If you want to order the ozone generator and/or the boric acid powder, let me know so I can find out the US post office priority mail shipping cost to deliver both items to you in the Bahamas. Your fifth step should be to use a fogging machine to fog boric acid powder mix into your air con equipment and ducts to kill existing mold not killed by the ozone generator and to leave a powdery coating inside the equipment and ducts to help prevent future mold growth.  Your sixth step is to buy several programmable dehumidifiers from the States to keep your indoor humidity below the 70% threshold level that enables mold to grow quite well from high humidity alone.  Please email me your followup mold remediation questions. In service, Phillip Fry, mold expert, Certified Environmental Hygienist, Certified Mold Inspector, and Certified Mold Remediator 

Jan. 24, 2012. Found you through several Google searches regarding mold.  We discovered that our HVAC systemís drain pipe had been buried resulting in water backing up into the unit and causing mold.  It is evident in the plenum that pushes the air out as well.  Having 4 companies come out and talk to us, I am not having a great time figuring out our best course of action.  Our biggest question is whether our unit should be replaced or not.  It is 8.5 yrs old and runs fine.   Any light you can shed would be appreciated.  Thank you.

A. You should take several steps in this order to save your heating, ventilating, and air conditioning (HVAC) system and to do mold cleaning and mold remediation in your entire house: (1) find the best air duct cleaning company and your area and have that company completely clean out the air ducts of your HVAC system to get rid of all accumulated mold spores, mold growth, and accumulated dirt and dust (great mold food in the wet, mold-conductive HVAC environment); (2) have the best air con service company in your area dismantle and completely clean and disinfect your heating/air con equipment with boric acid powder (buy 50 pounds of boric at in warm water or any other good mold remover/killer recommended by the air con service company; (3) buy and use our low cost home model ozone blaster ( to do at least a one hour to two hour ozone blasting treatment of your entire HVAC system and then of all rooms and areas of your house (which will be very mold cross-contaminated from the mold spore-laden air outflow from your moldy HVAC); (4) do fogging of your HVAC equipment and ducts with boric acid powder to leave a white powdering coating on the interior HVAC surfaces to kill any remaining mold spores and to prevent future mold growth---use the low cost Hurricane model fogging machine you can buy online at; (5) scrub all walls, floors, and furnishings of your home with boric acid in warm water (24 to 36 ounces of Boric per gallon of hot water for a very strong cleaning mixture) to remove any deposited/landed mold spores. The boric fogging should be at least 36 ounces per gallon of hot water used in the fogging machine. Keep the ozone generator and fogging machine for future use or make money with them helping other mold victims in your area. If you have mold remediation followup questions, I am here to serve you. Thanks, Phillip Fry, mold consultant, Certified Environmental Hygienist, Certified Mold Inspector, and Certified Mold Remediator

Q. Dec. 20, 2011. I work for an air conditioning company in Louisiana.inside most units is what looks like black residue,or mold,is it mold and should I be certified to clean this?should I be touching it with my hands?I'm not wearing any masks or anything either.can u help? If it is mold is my company responsible for the growth? I am starting to get sick and I need to know because my boss doesn't care!!! If this is dangerous I have another job offer--- can you please help?

A. Air conditioners and air con equipment are mold factories that need thorough internal cleaning, along with duct cleaning, at least every three months to be health safe for use.  You can safely presume that the black residue is mold.  You should not be cleaning air con equipment and ducts without using a 3M brand breathing respirator with organic vapor filters, eye goggles, and other protective gear explained in the 25 steps for safe and effective mold remediation .  Insist that your boss provide you with proper mold remediation safety gear and provide you with mold remediation training. Not protecting you against mold exposure is a violation of state and federal worker safety laws (e.g., U.S. Occupational Safety and Health Administration and its Louisiana counterpart). If you boss wonít protect you, take that other job offer!!! Your health problems will get worse and worse if you don't protect yourself from mold exposure. Please read my in depth ebook Mold Health Guide, only $15 for email attachment delivery to you at  Best wishes, Phillip Fry, Certified Environmental Hygienist

Q. October 2, 2011. Attached are some pictures of the self mold tests that I did using do it yourself mold test kits. Our home is 11 years old and uses forced air. I have noticed that there is a mild musty smell coming out of the vents when the AC is being run, this is what lead me to conduct a test. Also we tend to have allergies which may be related. Can you please tell me what I need to do to eliminate this mold problem? We have little children and I am a bit disturbed by the positive results. 

A. The bluish green mold colonies in your mold test kit pictures are the combination of Aspergillus and Penicillium mold, the second and third most unhealthy indoor mold species.  Mold growing in your heating, ventilating, and air conditioning (HVAC) system is a disaster in terms of your family health because the mold spores from the mold growing in your HVAC system are continually thrown into the air from the outward air flow from the HVAC registers. These airborne mold spores make your family sick and also mold cross contaminate your entire house. First step---You need to do ozone blasting at least two or three separate times for one hour each time into your heating/cooling fresh air intake to kill mold spores and mold growth inside the HVAC. You also need to do ozone treatment of your entire house. You can buy our low cost, very powerful high ozone generator Bio3Blaster for these repeated treatments at  Be sure to read the posted use and safety instructions to use ozone treatment safely and effectively in your home. Second step---after the ozone treatments of your HVAC, then use a fogging machine to fog boric acid powder mix into your fresh air HVAC intake or into its return air duct, as well as into each of the HVAC registers.  Do the fresh air intake or return air duct while the system is running on fan ventilation. Do fogging of the individual ducts when the system is NOT running.  The best quality fogging machine at a low price is the Hurricane model available from  For the best quality boric acid powder and for the mix formula, please visit the boric pages on  Once you own both the Bio3Blaster and the Hurricane fogging machine, you can make big money renting them out to help mold victims in your area. While on Mold Mart, consider buying two of my ebooks that you really need: (1) Mold Health Guide; and (2) Do It Best Yourself Mold Inspection, Testing, Remediation, and Prevention, only $15 each for email attachment delivery to you. Please email me any followup mold questions you may have. In service, Phillip Fry, manager, Certified Environmental Hygienist, Certified Mold Inspector, and Certified Mold Remediator.


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For mold inspection, mold remediation, and mold prevention for your real estate property anywhere in the world, please contact mold consultants Phillip Fry and Divine Montero by email or by phone toll-free 1-866-300-1616 or 1-810-639-0523 or cell phone 1-480-310-7970.         Website updated August Nov. 23, 2015, by mold expert Phillip Fry