HVAC & Air Duct Mold Remediation in Los Angeles

If you can smell mold every time your HVAC system turns on, you likely have mold in your air ducts. That mold is circulating spores through every room in your building, and standard duct cleaning will not solve the problem. Absolute Maintenance & Consulting provides complete HVAC mold remediation for residential and commercial properties across Los Angeles, and we do something most duct cleaning companies cannot: we find the moisture source that caused the mold and fix it so it does not come back.

Mold in air ducts is almost always a moisture problem, not just a cleanliness problem. Condensation from building envelope failures, roof leaks dripping onto ductwork, poor insulation around supply lines, and clogged condensate drains all create the damp conditions mold needs to colonize your HVAC system. Absolute Maintenance & Consulting has the mold remediation credentials and the water intrusion investigation expertise to handle both sides of that equation.

Cameron Figgins, founder of Absolute Maintenance & Consulting, has spent over three decades investigating moisture problems and remediating mold in Los Angeles County buildings. We hold IICRC certification (#70018676), MICRO certification for mold assessment and remediation, and CSLB license #998184.

More common than most property owners realize, especially in Los Angeles. LA’s mild climate means HVAC systems cycle between heating and cooling frequently, and the temperature swings create condensation inside ductwork. Add in the city’s aging building stock, where many structures have uninsulated or poorly insulated ducts running through attics and crawl spaces, and you have conditions that favor mold growth year-round.

You are at higher risk for mold in your air ducts if:

• Your building is 20+ years old with original ductwork that has never been inspected for moisture
• Ducts run through an unconditioned attic or crawl space where temperature differentials cause condensation
• Your building has experienced water intrusion from a roof leak, wall leak, or plumbing failure near duct runs
• The HVAC condensate drain has clogged or overflowed at any point
• You have had water damage that was not thoroughly dried within 48 hours
• Fiberglass duct liner or duct board is present (porous materials that trap moisture and are very difficult to clean once colonized)

According to the EPA, mold can begin growing on damp surfaces within 24 to 48 hours. Inside an HVAC system, the combination of darkness, organic material (dust and debris), and persistent moisture makes ductwork an ideal environment for mold colonies. Once established, those colonies release spores that your air handler distributes through every supply register in the building.

Homeowners in Los Angeles typically discover mold in their air ducts through one of three signs: a musty smell when the system runs, visible dark growth around supply registers or on exposed ductwork, or unexplained allergy symptoms that worsen at home. If you are experiencing any of these, your HVAC system needs more than a cleaning. It needs a full assessment, remediation, and moisture source correction.

Common residential causes of HVAC mold in Los Angeles:

Residential HVAC mold remediation typically takes 1 to 3 days depending on the size of the system, the extent of contamination, and whether duct materials need replacement. We contain the work area, run negative air pressure, and use HEPA filtration throughout the process to prevent cross-contamination.

Commercial buildings in Los Angeles face HVAC mold challenges at a larger scale. Rooftop air handling units, extensive duct networks running through plenums and above drop ceilings, and variable air volume systems all create more surface area for mold colonization and more points where moisture can enter the system.

Absolute Maintenance & Consulting provides commercial HVAC mold remediation for:

• Office buildings where tenants report indoor air quality complaints. We assess the HVAC system, identify contamination, remediate, and provide post-remediation verification documentation.
• Multi-unit residential (apartments, condos, HOAs) where mold in shared HVAC systems or individual unit systems affects multiple residents. We document findings for management and coordinate remediation to minimize tenant disruption.
• Retail and restaurant spaces where health department standards require clean air handling systems. Mold in commercial kitchen exhaust or supply systems creates compliance risk.
• Medical and dental offices where indoor air quality directly impacts patient safety and regulatory compliance.
• Schools and childcare facilities where occupant health sensitivity demands aggressive remediation standards and thorough post-remediation testing.

For commercial properties, we provide the documentation that building owners and property managers need: pre-remediation assessment reports, remediation protocols, containment verification, post-remediation air sampling results, and clearance documentation. Call (310) 678-4345 for a commercial assessment.

Absolute Maintenance & Consulting follows a structured protocol for every HVAC mold remediation project. We do not take shortcuts, and we do not skip the moisture investigation that prevents the mold from returning.

The full process typically takes 2 to 5 days for a complete residential system. Commercial projects vary by system size and contamination extent. We schedule work to minimize disruption, and we coordinate with your HVAC contractor if equipment repairs or replacement fall outside our scope.

If you have already had your ducts cleaned and the mold returned, the cleaning company treated the symptom without addressing the cause. Mold in air ducts is a moisture problem. Until you eliminate the moisture, mold will re-colonize cleaned surfaces within weeks.

This is where Absolute Maintenance & Consulting is different from duct cleaning companies. We are a water intrusion investigation and mold remediation firm. Finding moisture sources is our core specialty. We use the same diagnostic tools we deploy on building envelope investigations to track moisture inside your HVAC system:

• Thermal imaging identifies temperature anomalies on duct surfaces, pinpointing exactly where condensation forms or where external moisture contacts the ductwork
• Moisture mapping quantifies moisture levels on and around duct runs, air handlers, and surrounding building materials to map the full extent of the moisture problem
• Building envelope inspection evaluates whether roof leaks, wall leaks, or other envelope failures are introducing moisture near your HVAC system

Once we identify the source, we fix it as part of the remediation project. Your HVAC mold remediation investment addresses the mold and the moisture, so you do not end up paying for the same service again in six months. 

You cannot always see mold in your air ducts because most ductwork is hidden above ceilings, in attics, and in wall cavities. But there are clear warning signs that indicate your HVAC system has a mold problem:

Smell:

• A musty, earthy, or stale odor that appears when the HVAC system turns on and fades when it turns off
• The smell is strongest at supply registers closest to the air handler
• The odor is present in multiple rooms served by the same system

Visible indicators:

• Dark spots or discoloration around supply register edges or on surrounding ceiling/wall surfaces
• Visible mold growth on the air handler, evaporator coil, or inside accessible duct sections
• Black or dark green buildup on the grilles of supply or return registers

Health symptoms:

• Respiratory symptoms (coughing, congestion, wheezing) that improve when you leave the building
• Increased allergy symptoms indoors, particularly when the HVAC system is running
• Multiple occupants reporting similar symptoms

System indicators:

• Condensation visible on the exterior of duct runs, particularly in the attic
• Water stains on ceiling drywall below attic duct runs
• HVAC drain pan holding standing water or showing signs of overflow

If you are noticing any combination of these signs, call (310) 678-4345 to schedule a mold inspection. We will assess your HVAC system and the surrounding building materials to determine the full extent of the problem.

The cost of HVAC mold remediation depends on the size of the system, the extent of contamination, the type of duct materials involved, and whether the moisture source requires significant repair.

Your initial $450 assessment fee is credited toward remediation if you hire Absolute Maintenance & Consulting for the project. The assessment is not a sunk cost. It is the diagnostic step that tells us exactly what your system needs and what the moisture source is.

We provide a written scope and estimate after the assessment, before any remediation work begins. No surprises. Call (310) 678-4345 for scheduling.

We find the moisture source, not just the mold. Most duct cleaning and mold remediation companies treat what they can see. Absolute Maintenance & Consulting uses thermal imaging and moisture mapping to trace the moisture to its origin and eliminate it. That is why our HVAC mold remediation projects stay fixed.

We hold the right certifications. IICRC certification (#70018676) for water damage restoration, MICRO certification for mold assessment and remediation, and CSLB license #998184 for construction and repair. We are qualified to assess, remediate, and repair.

We understand Los Angeles buildings. Three decades of investigating moisture problems in LA means we know the construction patterns, the common failure points, and the climate-specific conditions that cause HVAC mold in this market. Aging stucco buildings with uninsulated attic ductwork, mid-century flat roofs with poor drainage near rooftop equipment, hillside homes with condensation challenges. We have seen and resolved all of it.

Your assessment cost is credited toward remediation. We do not charge you separately for the investigation and the repair. Your $450 assessment investment applies directly to your remediation cost.

We remediate and repair under one contract. You do not need to hire a mold company, then a leak detection company, then a contractor. Absolute Maintenance & Consulting handles the mold inspection, the remediation, the moisture source investigation, and the repair in a single coordinated project.

Still have questions? Our experts are here to help.

Absolute Maintenance & Consulting provides HVAC mold remediation throughout Los Angeles County, including West Los Angeles, Santa Monica, Venice, Culver City, Beverly Hills, Brentwood, Bel Air, Century City, Hollywood, Silver Lake, Echo Park, Pasadena, Glendale, Studio City, Sherman Oaks, Encino, and the South Bay communities.

Call (310) 678-4345 or email info@leakmoldrepair.com to schedule your HVAC mold assessment.