Your HVAC system is the one machine in your home connected to every room. When mold grows inside ductwork, on an evaporator coil, or in an air handler, the blower dutifully delivers spores to your bedrooms, your kitchen, your kids' rooms — every cycle, all day. Our air duct and HVAC mold cleaning in California removes mold from the entire air path: ducts, coils, drain pans, and air handlers, using contained, HEPA-filtered methods — not a spray-and-pray fogging. This is air duct mold cleaning California homeowners can verify with photos, not promises.
If you smell mustiness when the system kicks on, see dark growth around vents, or your household's allergies flare every time the AC runs, call (866) 854-9275 — our air duct mold cleaning California team inspects homes anywhere in the state.
A real HVAC mold job goes far beyond "duct cleaning." Here is what our service covers:
Full-system inspection first. We inspect supply and return ductwork, the evaporator coil, condensate drain pan and line, the air handler cabinet, and accessible plenums — with photos you can see. Many companies quote duct cleaning over the phone; we diagnose before we prescribe, because mold on a coil needs a different fix than dust in a duct.
Contained duct remediation. Mold-affected duct sections are cleaned under negative pressure with HEPA-filtered vacuum collection, so dislodged spores are captured — not blown into your living space. Agitation tools (rotary brushes, air whips) are selected for your duct type: flex, sheet metal, and duct board each need different handling.
Evaporator coil cleaning and decontamination. The coil is the most common mold site in California HVAC systems — dark, damp, and fed with dust. We clean coils with appropriate (non-corrosive) methods, clear the condensate drain, and treat the drain pan, because a coil that cannot drain will grow mold again within months.
Air handler and plenum remediation. Cabinets, blower compartments, and plenums get HEPA-vacuumed, wiped, and treated. Fiberglass duct board with deep mold growth is removed and replaced rather than "cleaned" — cleaning cannot reach hyphae embedded in porous insulation.
Moisture-source correction guidance. Mold in HVAC is a symptom. We identify the cause — undersized returns causing coil freeze-thaw, clogged condensate lines, ductwork sweating in hot attics, oversized systems short-cycling — and tell you exactly what to fix so it does not return. Where the fix is in our scope (drain clearing, pan treatment), we do it; where it needs an HVAC contractor, we give you a precise punch list.
Post-service verification. After cleaning, we re-inspect with photos: clean coils, clear drains, no visible growth, no residual odor at the registers. You see the before and after, not just a receipt.
An honest note: if your ducts are merely dusty with no mold, we will tell you that too — and a standard duct cleaning (not mold remediation) is the right, cheaper service. We sell the service you need, not the most expensive one.
1. Inspection and diagnosis. A technician inspects the full air path, photographs findings, and shows you exactly where mold is — and where it is not. You get a written scope distinguishing mold remediation (where growth exists) from standard cleaning (where it does not).
2. System isolation. The HVAC is shut down and the work zone isolated. Supply registers are sealed during duct agitation so nothing migrates into living spaces.
3. Negative-pressure contained cleaning. Ductwork is cleaned section by section under HEPA-filtered negative pressure. Coils, pans, and air handlers are cleaned and treated. Contaminated porous materials (lined duct board sections, insulation) are cut out and replaced.
4. Drainage and airflow correction. Condensate lines cleared, pans treated, and the root-cause punch list delivered — the fixes that keep mold from returning.
5. Verification. Post-service inspection with photos, airflow check, and odor check at the registers. Written summary of what was remediated and what preventive steps we recommend.
HVAC mold work is priced by system size, contamination extent, and access. Realistic 2026 California ranges:
What moves the price: number of HVAC systems, attic vs. closet installation (attic work in a California summer is slower and hotter), flex vs. sheet-metal ductwork, and whether contaminated duct board must be replaced rather than cleaned. Beware the $99 whole-house duct-cleaning coupon — that price cannot cover real mold remediation; it is a foot in the door for upsells. Our quotes are written, itemized, and fixed.
We diagnose before we clean. Most duct-cleaning outfits sell the same service to every house. We inspect first and scope honestly — mold remediation where there is mold, standard cleaning where there is not. You will never pay remediation prices for a dust problem.
Contained, HEPA-filtered methods. Agitating moldy ducts without negative-pressure containment just redistributes spores through your home. Our process captures at the source, every time.
IICRC-trained technicians. California has no state mold license — the person cleaning your air handler may have no training at all. Ours train to the ANSI/IICRC S520 Standard, and we follow NADCA-aligned practices for ductwork handling.
Root-cause focus. Cleaning mold off a coil without fixing the clogged drain that fed it is a recurring-revenue plan, not a service. We find and address the moisture source, and we tell you plainly what needs an HVAC contractor versus what we handle.
Written guarantee. Our HVAC mold remediation carries our written workmanship guarantee. If mold returns to a remediated component because the moisture cause we identified was not addressed per our guidance, we work with you on the correction.
Call (866) 854-9275 for an HVAC mold inspection anywhere in California.
We serve 50+ cities statewide. California's climate creates distinct HVAC mold patterns our technicians know:
How do I know if I have mold in my ducts or just dust? Musty odor when the system starts, visible dark growth around supply registers, allergy or respiratory flare-ups that track with AC runtime, and a history of condensate drain problems all point toward mold rather than dust. The definitive answer comes from inspection — we photograph the coil, pan, and duct interiors and show you. If it is just dust, we will say so and recommend standard cleaning instead.
Can mold in my HVAC make my family sick? Moldy HVAC distributes spores to every room on every cycle, which is why health complaints tied to HVAC mold (stuffy nose, coughing, aggravated asthma or allergies when the system runs) are common. People with asthma, allergies, or compromised immunity are most affected. We are remediators, not doctors — but removing the source ends the exposure, which is the part we control.
Will you need to replace my ductwork? Usually not. Sheet-metal and flex ducts with surface growth can be remediated in place under containment. Porous fiberglass duct board with deep, embedded growth cannot be reliably cleaned — those sections are cut out and replaced, and we show you why before doing it. Most jobs are cleaning, not replacement.
How long does HVAC mold remediation take? A single-system coil and air-handler remediation: half a day. Duct mold remediation for a typical home: one full day. Multi-system or heavy-contamination jobs: two days. You do not need to leave the home — the system stays off during work and is verified before restart.
How do I keep mold from coming back in my HVAC? Fix the moisture cause we identify: keep condensate drains clear (a $10 annual habit), change filters on schedule, ensure the system is not oversized for the home, and have coils inspected every couple of years. Our closeout includes a specific prevention punch list for your system — follow it and recurrence is rare. For ongoing protection, ask about our mold prevention and moisture control service.
Every cycle of a moldy HVAC system spreads the problem to another room. Get it diagnosed, remediated, and root-caused by a crew that does this work every day.
Call (866) 854-9275 for air duct and HVAC mold cleaning anywhere in California — honest inspection first, written fixed quote, and a written guarantee on every remediation.
Musty odor when the system starts, visible dark growth around supply registers, allergy or respiratory flare-ups that track with AC runtime, and a history of condensate drain problems all point toward mold rather than dust. The definitive answer comes from inspection — we photograph the coil, pan, and duct interiors and show you. If it is just dust, we will say so and recommend standard cleaning instead.
Moldy HVAC distributes spores to every room on every cycle, which is why health complaints tied to HVAC mold (stuffy nose, coughing, aggravated asthma or allergies when the system runs) are common. People with asthma, allergies, or compromised immunity are most affected. We are remediators, not doctors — but removing the source ends the exposure, which is the part we control.
Usually not. Sheet-metal and flex ducts with surface growth can be remediated in place under containment. Porous fiberglass duct board with deep, embedded growth cannot be reliably cleaned — those sections are cut out and replaced, and we show you why before doing it. Most jobs are cleaning, not replacement.
A single-system coil and air-handler remediation: half a day. Duct mold remediation for a typical home: one full day. Multi-system or heavy-contamination jobs: two days. You do not need to leave the home — the system stays off during work and is verified before restart.
Fix the moisture cause we identify: keep condensate drains clear (a $10 annual habit), change filters on schedule, ensure the system is not oversized for the home, and have coils inspected every couple of years. Our closeout includes a specific prevention punch list for your system — follow it and recurrence is rare. For ongoing protection, ask about our [mold prevention and moisture control service](/mold-prevention-moisture-control/).
Our California crews are ready 24/7. Call now for a free assessment and upfront quote.
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