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HVAC mold remediation specialist conducting evaporator coil and air handler cleaning in a modern Westside Los Angeles HVAC closet.
Los Angeles · HVAC & Air Duct

HVAC & Air Duct Mold Removal Los Angeles

HVAC and air duct mold removal in Los Angeles by specialists working under NADCA ACR 2021 combined with IICRC S520 Level V. Our team remediates evaporator coils, condensate pans, ductwork (sheet metal cleaned, flex replaced), air handlers, mini-split heads, and plenums.

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What Does HVAC Mold Removal Cover in LA?

HVAC and air duct mold removal in Los Angeles is the combined NADCA ACR 2021 + IICRC S520 Level V remediation of evaporator coils, condensate pans and drain lines, sheet-metal and flex ductwork, air handler cabinet interiors, plenums, supply boots, and ductless mini-split heads. The IICRC S520 standard designates Level V for any HVAC contamination regardless of size — the standard that separates competent HVAC mold work from generic duct cleaning.

The dominant LA pattern is attic-located ducts on 1970s SFV ranch homes (91367 Woodland Hills, 91335 Tarzana, 91324 Northridge), where supply-air temperature drops below dew point on May–August marine-layer mornings and produces chronic duct-exterior condensation. Oversized AC short-cycling is the underlying mechanical cause in many cases — ACCA Manual J load calculation diagnoses the root cause.

The flex-duct-vs-sheet-metal distinction reframes 60%+ of LA HVAC mold quotes. Flex duct (R-6, R-8) is non-cleanable under NADCA when contaminated — replacement, not cleaning, is the correct scope. Sheet metal duct can be remediated in place with mechanical agitation, HEPA collection, and antimicrobial fog.

What HVAC Mold Removal Covers

  1. 01

    HVAC Mold Inspection and System-Wide Diagnostic

    Supply registers, return grilles, evaporator coil, condensate pan, drain line, blower wheel, air handler interior, plenum, supply boots, and accessible ductwork — borescope inspection across all components.
  2. 02

    Evaporator Coil Mold Remediation

    Aspergillus, Penicillium, Cladosporium, Fusarium colonize the fin pack on condensate film. Coil removal (where possible) or foam-cleaning with Nu-Calgon Evap Foam, antimicrobial treatment, drain pan replacement.
  3. 03

    Condensate Pan, Drain Line, and Trap Remediation

    Standing water in pan feeds biofilm; clogged drain line drives overflow. Pan cleaning/replacement, drain line flush with EPA-registered antimicrobial, P-trap installation, float switch addition.
  4. 04

    Ductwork Mold Remediation — NADCA ASCS Protocol

    Sheet-metal duct may be remediated in place under NADCA ACR + S520 Level V. Flex duct interior is non-cleanable when contaminated — replacement, not cleaning, is the correct scope.
  5. 05

    Air Handler Cabinet Interior Remediation

    Cabinet walls, blower wheel, blower housing, filter rack accumulate mold above the coil. Blower-wheel removal, HEPA cleaning, antimicrobial application, cabinet interior re-sealing.
  6. 06

    Mini-Split Head Mold Remediation

    Mitsubishi MSZ-FH, Daikin Quaternity, Fujitsu Halcyon, LG ArtCool indoor coils and blower wheels accumulate mold within 2–4 years. Cover and blower removal, deep cleaning, antimicrobial.
  7. 07

    Plenum and Supply Boot Remediation

    Sheet-metal supply plenum and individual supply boots accumulate condensation in unconditioned attics/crawl spaces; mold colonizes duct-mastic seal and insulation jacket interior.
  8. 08

    UV-C Light Installation and Coil Sanitization

    Fresh-Aire UV APCO-X, Sanuvox Quattro 16–36W germicidal lamps inhibit ongoing mold regrowth. UV-C output degrades 30–40% in the first year — annual lamp replacement is required.
  9. 09

    Mold-Caused Oversizing and Short-Cycling Diagnosis

    Oversized AC short-cycles, never dehumidifies, leaves condensate film on coil. ACCA Manual J load calculation diagnoses the underlying mechanical cause.
  10. 10

    Attic-Located Duct Condensation Pattern (LA-Specific)

    May–August marine-layer mornings drive supply-air temperature below dew point on duct exterior in unconditioned attics — chronic condensation. 1970s SFV ranch homes display universally.
  11. 11

    Post-Remediation Verification — HVAC Level V Clearance

    Visual verification of 5 system components, surface tape-lift on coil and plenum, supply/return air sampling against outdoor control, certified clearance documentation.
  12. 12

    HVAC Trade Coordination and Replacement Scope

    Replacement-vs-remediation decision for 15+ year systems, coordination with HVAC contractor, A2L refrigerant transition (R-32, R-454B), CA HERS duct-leakage testing trigger at 40+ ft replacement.

Our HVAC Remediation Process

  1. 1

    System-wide diagnostic and borescope

    Walkthrough of coil, pan, drain, plenum, supply boots, and visible ductwork; borescope inserted through access ports to image interior surfaces.

  2. 2

    Containment and HEPA negative-air

    OmniAire 600V or Phoenix R175 HEPA AFD pulls negative pressure during work; supply and return registers sealed during active work.

  3. 3

    Coil and drain pan cleaning

    Nu-Calgon Evap Foam coil cleaner, drain pan removal and antimicrobial treatment, P-trap installation and float switch addition.

  4. 4

    Duct mechanical agitation

    Rotobrush, Hypervac CMD, or Nikro DV-15 mechanical agitation with HEPA collection on sheet metal duct interior.

  5. 5

    Flex duct replacement (where applicable)

    Contaminated flex duct demolished and replaced with new R-8 insulated flex; HERS testing triggers at 40+ ft replacement under CA Title 24.

  6. 6

    Air handler and cabinet remediation

    Blower wheel removal, deep clean, antimicrobial; cabinet interior cleaned and resealed.

  7. 7

    Antimicrobial fog and clearance verification

    Dyna-Fog ULV or Vectorfog cold fog through duct system; supply/return air sampling against outdoor control confirms Level V clearance.

Borescope inspection of ductwork interior during HVAC mold remediation in a Los Angeles home.

HVAC Mold Remediation Cost Estimator

Itemized estimate combining NADCA ACR 2021 and IICRC S520 Level V scope for LA forced-air and mini-split systems.

HVAC Mold Remediation Cost Estimator

Itemized estimate combining NADCA ACR 2021 and IICRC S520 Level V scope for LA forced-air and mini-split systems.

Components affected (check all that apply)

Flex Duct vs Sheet Metal — Clean or Replace

The single most consequential decision in HVAC mold scoping. NADCA ACR defines flex duct as non-cleanable when contaminated.

Ductwork remediation decision matrix
ComponentDecisionMethodCostOutcome
Sheet metal ductRemediate in place (NADCA ACR)Mechanical agitation + HEPA collection$0.95–$1.90 / sq ft duct surfaceSalvageable — clean and seal
Flex duct (R-6, R-8)Replace (non-cleanable per NADCA)Demolish and dispose$1.85–$2.60 / sq ft new ductReplace with new R-8 insulated flex
Duct board (fiberglass)Replace if contaminatedDemolish and dispose$2.20–$3.50 / sq ftReplace with sheet metal or new duct board
Plenum (sheet metal)Remediate in placeHEPA + antimicrobial$480–$880 typicalRe-seal mastic joints
Visible mold present? YES NO Affected area > 10 sq ft? Air sampling shows elevated indoor counts? YES NO Condition 3 Level II/III Condition 3 Level I/II Condition 2 or 1 Cross-contamination check Condition 1 = normal baseline · Condition 2 = settled spores · Condition 3 = active growth
NADCA + IICRC Level V scope decision logic
Completed HVAC mold remediation with cleaned evaporator coil, new drain pan, UV-C lamp installed, and sealed access panels in a Los Angeles air handler.
Modern Westside Los Angeles residential HVAC closet architectural context where HVAC mold projects are routinely conducted.

HVAC Remediation Equipment

HVAC equipment cluster

  • Phoenix R175 / R225 HEPA negative-air scrubber HVAC closet containment
  • Rotobrush Mechanical duct agitation Sheet metal duct interior
  • Hypervac CMD High-power duct agitation Heavy-soil sheet metal
  • Nikro DV-15 HEPA collection vacuum Duct cleaning collection
  • Buck Bio-Air Air sampling pump Supply/return air sample
  • Nu-Calgon Evap Foam No-rinse coil cleaner Evaporator coil cleaning
  • Dyna-Fog Tornado ULV antimicrobial fogger Duct interior fog treatment
  • Vectorfog C100 Cold ULV fogger Coil and plenum sanitization
  • Fresh-Aire UV APCO-X 16–36W coil UV-C lamp Preventive coil UV-C
  • Sanuvox Quattro In-duct UV-C lamp Whole-system UV-C
  • Diversitech FS-1 Condensate float switch Drain overflow prevention
  • EZ Trap Clear PVC P-trap Visible drain trap install
HVAC mold remediation equipment flat-lay including borescope, coil cleaning foam, antimicrobial fogger, UV-C lamp, and respirator.

LA HVAC Mold Service Areas

Westside

  • Brentwood 90049
  • Westwood 90024
  • Bel Air 90077
  • Beverly Hills 90212
  • Santa Monica 90402
  • Pacific Palisades 90272
  • Venice 90291
  • Mar Vista 90066
  • Culver City 90232
  • Marina del Rey 90292

Hollywood / Mid-City

  • Hollywood 90028
  • Hollywood Hills 90068
  • West Hollywood 90069
  • Hancock Park 90004
  • Koreatown 90005
  • Mid-Wilshire 90036

East / Northeast LA

  • Silver Lake 90026
  • Los Feliz 90027
  • Atwater Village 90039
  • Eagle Rock 90041
  • Highland Park 90042
  • Mount Washington 90065

San Fernando Valley

  • Glendale 91205
  • Burbank 91504
  • North Hollywood 91601
  • Studio City 91604
  • Sherman Oaks 91423
  • Encino 91316
  • Tarzana 91335
  • Woodland Hills 91367
  • Northridge 91324
  • Van Nuys 91406

Pasadena / East

  • Pasadena 91101
  • South Pasadena 91030
  • San Marino 91108
  • Altadena 91001

South Bay

  • El Segundo 90245
  • Manhattan Beach 90266
  • Hermosa Beach 90254
  • Redondo Beach 90277
  • Torrance 90505
  • Inglewood 90301

South LA

  • Crenshaw / Baldwin Hills 90008
  • South LA 90044
  • Watts 90002
  • Compton 90220

DTLA

  • Downtown LA 90012
  • Arts District 90013
  • Bunker Hill 90071

LA HVAC Mold Cost Scenarios

$280–$520

HVAC mold inspection only, written scope report, no remediation.

Citywide
$340–$680

Evaporator coil cleaning with antimicrobial (no coil removal).

Citywide
$680–$1,400

Coil removal, deep clean, drain pan replacement, drain line treatment.

Citywide
$980–$2,200

Complete air handler interior (cabinet + blower + coil + pan) remediation.

Citywide
$1,600–$3,800

Sheet-metal duct mold remediation under NADCA ACR + S520 Level V, 2,000 sq ft home.

Citywide
$2,400–$5,200

Flex-duct replacement, 2,000 sq ft home, R-8 insulation.

Citywide
$320–$580 / head

Mini-split head deep mold remediation; whole-home 4–5 heads $1,400–$2,400.

Citywide
$3,600–$8,500

Whole-system HVAC mold remediation (coil, ducts, AHU, plenum, supplies).

Citywide
$2,800–$6,200

Post-atmospheric-river HVAC system remediation after attic-duct condensation event.

SFV
$1,800–$4,500

HVAC system replacement coordination — remediation portion; new system separate.

Citywide
$680–$1,200

UV-C lamp installation at coil, single-system, post-remediation.

Citywide
$480–$880

HVAC Level V clearance with third-party ACAC CIEC + lab analysis.

Citywide

Frequently Asked Questions

Related Services

Attic Mold Removal Los Angeles

Sheathing remediation post-atmospheric-river and ventilation upgrades.
Mold Testing Los Angeles

Air, surface, ERMI, HERTSMI-2, and mycotoxin lab analysis.
Mold Remediation Los Angeles

Full IICRC S520 mold remediation across LA County.

Need HVAC Mold Removal in LA? Get a Level V Scope.

Serving all of Los Angeles County.

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