Duct Cleaning and Sealing in Miami, FL
Miami attic ducts in homes built 1960 through 1985 often leak 20 to 35 percent of supply air into the attic. That pulls humid outside air into the return side and leaves you at 65 percent indoor RH while the AC runs nonstop. CheckedHomePros routes duct cleaning and sealing work to NADCA-certified pros who run negative-pressure HEPA collection systems and Aeroseal aerosol sealant. A 1,800 sq ft Westchester home with leaky ducts typically sees a 12 to 22 percent cooling-bill drop after Aeroseal.
What duct cleaning & sealing actually involves
NADCA-standard duct cleaning with HEPA negative-pressure collection.
Aeroseal aerosolized vinyl-acetate sealant for sealing from inside the ducts.
Manual mastic sealing of accessible joints and return-side boots.
Pre and post duct leakage testing (CFM25) with Minneapolis Duct Blaster.
Boot sealing at register grilles in ceilings and walls.
Miami-specific things to know
- Disconnected flex ducts in 1970s Pinecrest attics after rodent activity or A/C tech traffic on rafters.
- Compressed flex runs in low-clearance Hialeah hip-roof attics, dropping CFM 25 to 40 percent below design.
- Rusted metal trunk seams in 1960s Coral Gables homes leaking conditioned air into the attic.
- Failed mastic at supply boots in Coconut Grove additions, causing wet ceiling stains during 76°F dew-point weeks.
- Return-side leakage at filter cabinet on 1980s Doral homes pulling unfiltered attic air past the blower.
Typical duct cleaning & sealing pricing in Miami
$485–$4,200
Duct cleaning $485 to $980 for typical 1,500 to 2,200 sq ft home. Aeroseal duct sealing $1,800 to $3,200. Combined cleaning plus Aeroseal package $2,400 to $4,200.
What to ask each pro you compare
- ✓Are you NADCA-certified, and which standard (NADCA ACR 2021) do you follow?
- ✓Will you measure duct leakage before and after with a Minneapolis Duct Blaster?
- ✓Is this Aeroseal aerosol sealing, manual mastic sealing, or both?
- ✓How do you protect furniture and floors from collection-system dust?
- ✓Will you inspect and seal supply and return boots at each register?
- ✓What is the warranty on Aeroseal (typically 10 years)?
Our vetting standard for duct cleaning & sealing pros
- ✓Florida CMC license verified at MyFloridaLicense.com.
- ✓NADCA membership and ASCS (Air Systems Cleaning Specialist) certification.
- ✓Aeroseal-certified contractor status for aerosol sealing work.
- ✓Manometer or Duct Blaster for pre and post leakage testing.
- ✓Written before-and-after leakage report (target less than 6 percent of total CFM per ENERGY STAR).
- ✓10-year Aeroseal manufacturer warranty pass-through.
Duct Cleaning & Sealing: common questions
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