What to do about belongings, HVAC systems, landlords, home sales, and even your car
Mold questions rarely stay simple. It starts with, “Is that mold on my wall?” Pretty soon you’re worrying about your clothes, HVAC system, your real estate deal, and even your car.
In this episode of my mold series, I tackle some of the “special situation” questions I get all the time. This article is a clear, non-hype walkthrough of those same issues so you can make smart decisions instead of panicking, or getting talked into unnecessary work.
We’ll cover:
- Can mold damage your belongings?
- What to do if you find mold in your HVAC
- How mold affects property value and home sales
- Legal options with landlords and contractors
- Can mold grow in your car or vehicle?
Can Mold Damage My Belongings?
Short answer: Yes, not because there’s mold in your house. The key question is: Did it get wet?
Mold needs water to grow. Not humidity, not fear, not a positive mold test somewhere else in the house. Water. Clothes in drawers or closets that never got wet? Mold can’t grow on them. You might get normal dust on them that contains mold spores (like everywhere on Earth). That’s not the same as actual mold growth. Items in closed cabinets that stayed dry? Same story. No water, no mold growth.
Where things get confusing is cross-contamination. If you’ve had sloppy remediation – for example, walls torn out with no containment, dust gets everywhere, doors open, no proper negative pressure, then moldy drywall dust can land on your belongings. Here’s the distinction: dust on your stuff is a cleaning problem, not an automatic “throw everything out” problem.
That’s why I wrote my book Dust Money: How to clean your home and belongings after mold remediation so you don't have to throw everything away – to help you tell what really needs to be discarded, what can be cleaned, and how to clean it properly so you don’t waste thousands of dollars out of fear. Mold can grow on belongings that got wet (cardboard boxes on a wet floor, clothes in a flooded basement, porous furniture in a flood). Most of the time dry clothes can be cleaned. Dry dishes, shelves, and books are cleanable. You don’t need to, should not, “treat” your belongings.
If your stuff was in a house that had mold but they did not get wet, you just need to clean the dust off them and make smarter decisions.
What Should I Do If I Find Mold in My HVAC System?
First, let’s translate this question into reality. Most people say, “I saw something that looks like mold in my HVAC.” After inspecting everything from tiny window units to commercial systems big enough to walk inside, I can tell you that a lot of what looks like mold is just dust. Some of what looks like “nothing” actually is mold. And you cannot reliably tell with your eyes or pictures. Step 1 is test it.
How to Test Suspected Mold in HVAC
Forget swabs. For surfaces, you want a tape-lift sample, not a Q-tip. Swabs are often misused and less reliable for building-surface interpretation. Tape lifts give a clearer picture of what’s really on that surface. I teach this in detail in my course on surface sampling, not because the act of pressing tape on something is hard, but because, rather, you have to know what to ask the lab to do with the sample, and you need to know how to interpret the results. That’s covered in my course. Asking the lab to “count spores” is not going to give you the best answer.
If It Is Mold, Then What?
The basic principles of HVAC remediation are the same as for the rest of the house. Remove porous materials that are moldy: Insulation, sound baffles, fiberglass lining, certain duct board materials. Clean non-porous surfaces. Metal, plastic, and other hard surfaces can be cleaned and wiped using plain soap and water. Do NOT use a “mold killer” as a solution. Do not use bleach. These are poor at cleaning. Fogging, spraying biocides, “sanitizing” the system – all of that might is a waste of time and creates new problems you didn’t have before. Dead mold can still trigger reactions. You haven’t removed the particles.
If there truly is heavy mold contamination inside a system, sometimes the most cost-effective answer is to replace the system instead of trying to save it. Don’t jump there immediately. And don’t replace your whole HVAC before you’ve properly remediated mold in the house itself or your new system will pull in and recirculate mold from a contaminated environment.
This is where a consultation with a step-by-step plan can help. Done wrong, you could spend a lot of money and still feel sick or have mold in your home. I also have a course on how to inspect your HVAC for mold. It’s included in the course “Where to Look for Mold and What to Do When You Find it.”
How Does Mold Affect Property Value or Home Sales?
If you search online, you’ll see: “Mold reduces property value and makes homes harder to sell. That’s sometimes true, not always. I see two kinds of buyers when mold is disclosed. The first is “We don’t care, show us the report.” They see that remediation has been done, maybe they’re not mold-sensitive, and they’re satisfied with paperwork.
The second type are cautious buyers who know the industry is sloppy. These people understand why I write my books. They understand that “we had it remediated” does not automatically mean the mold was removed. They’ve seen too many cases where remediators sprayed and “treated” the mold, the mold inspector only took air samples, or there were cozy relationships between contractors and inspectors. If you give me 100 houses “certified remediated” and put them up for sale, I’ll find mold in more than half of them.
If You’re the Seller: Be Honest and Smart
My advice is to disclose, disclose, disclose. Keep proper documentation: inspection reports, lab results, scopes of work, estimates, receipts. When a buyer has questions about the mold report, don’t try to interpret and explain the results. Don’t play expert. Instead, say something as, “Here is the professional inspection report and the lab report. If you have questions, please call the inspector directly.”This protects you from misstatements, misunderstandings, and saying something well-meaning while technically wrong that comes back to haunt you
A Fair Way to Handle Remediation Costs
The fairest approach I’ve ever seen (rare, but ideal) is to get a realistic, worst-case remediation estimate. Put double that amount into escrow, enough to cover remediation, testing after the remediation company is done doing the work in the original estimate, plus a second round of testing if needed in the even more mold is found and the contractor fails the first post test.
Whatever is not used in the escrow account should go back to the seller after everything passes. In the real world, this rarely is done because sellers don’t want large sums left in escrow, realtors want to close the deal fast, and everyone wants certainty on a dollar amount to remediate the mold, when it’s not certain how much mold there is and what it will take to get rid of it all. If you want a truly fair approach that respects both buyer and seller, that’s it.
What Legal Steps Can I Take If My Landlord or Contractor Doesn’t Address Mold?
Let’s split this into two situations.
A. Landlord Won’t Fix Mold
I wrote book, Rent Money: The Toxic Mold Handbook for Tenants and Landlords, specifically to help both tenants and landlords understand mold issues fairly. Don’t jump to legal action. Start with clear communication. Many landlords don’t understand mold. Some are misinformed and panic. Sometimes the tenant is sure there’s mold, and there actually isn’t.
Get a proper inspection and testing. Not every “musty smell” is mold. I’ve been called into rentals where tenants were ready to sue, and I had to tell them, you don’t have mold.
If there is real mold and it’s significant, my general advice to tenants is, if at all possible, leave; My general advice to landlords is to let them leave, especially if the problem is serious and you can’t address it quickly and properly.
Sometimes tenants stay because it’s an amazing location, the price is far lower than anything comparable, or they simply have no other viable housing options. In those cases, the goal shifts from “perfect solution” to “how do we reduce risk and handle this as fairly as possible?”
Legal action is an option, but it’s messy, expensive and takes time. I’ve seen good outcomes and unfortunate bad ones. Rent Money focuses on how to investigate correctly, how to document issues, how tenant and landlord can work together, and how to reduce risk instead of immediately escalating into a battle.
B. Contractor Doesn’t Address Mold Properly
If your issue is with a remediator, builder, or contractor who covered it up, ignored obvious water damage, or did sloppy work that made things worse, then you’re in a different category: potential construction defect / professional negligence. In those cases, you need good documentation (photos, reports, lab data, contracts). You may need an expert witness to explain what went wrong and what proper work should have looked. That’s part of what I do— review cases and provide expert opinions when it’s justified.
Can Mold Grow in Cars and Vehicles?
Search the internet and you’ll see, “Yes, mold often grows in vehicles exposed to high humidity or leaks.” That’s overstated, and often wrong. Different molds like different materials. For example.. Stachybotrys (often called “black mold”) likes paper, drywall, straw, certain types of cellulose-rich materials
In a vehicle you mostly have glass, metal, plastic, vinyl, rubber, fabrics and carpet. Those are not the same types of materials as drywall or ceiling tiles. Could some molds grow on certain car fabrics or insulation if they get soaked and stay wet? Anything is possible. In the majority of “my car smells moldy” cases, the culprit is not mold — it’s bacteria from water damage.
Bacteria thrive quickly in damp environments, produce strong odors, and often show up before mold has any real chance to establish. When someone says, “My car smells musty, do I have toxic black mold?” my answer is usually, “You might have water damage and bacterial growth — which is still a problem. Don’t panic about a car becoming a mini mold-house the way drywall can.”
What You Should Do If Your Car Smells
Don’t ignore it. Look for obvious leaks (sunroof, windshield, door seals, floor wetness). Dry everything thoroughly. Clean or replace soaked carpets or padding if they were genuinely saturated. Consider a professional detail with actual cleaning, not fragrance bombs. Don’t automatically assume your car is now a toxic mold cave.
Final Thoughts
“Special situations” often cause the most stress because they’re not covered by simple checklists. Here’s the core mindset to walk away with:
- Don’t panic. Get data. Test intelligently (right methods, right labs, right interpretation)
- Focus on source and removal, not just “killing” or “treating.” Whether it’s HVAC, walls, or contents
- Be honest, document, and protect yourself in real estate.
- With rentals, start with communication and good information before you go nuclear.
- Cars and mold aren’t what the internet tells you. Smells often mean moisture and bacteria, not necessarily catastrophic mold
Want to know more?
Disclaimer
The post is designed for educational purposes only. Our goal is to provide information and scientific data as to the potential hazards in the home or office. All the factors to be considered are beyond the scope of this post. We do not assume responsibility for choices or decisions made including those regarding mitigation. The principles presented here should empower the reader to make informed choices. Book a consultation.