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Why Your Ducts Are Leaking 30% of Your Cold Air (And How to Fix It)
The average LA home loses 25-35% of conditioned air to duct leakage. Here's what to do.
September 28, 2025 5 min read
How we test
Duct blaster test: pressurizes your duct system and measures CFM25 leakage. Most LA homes pre-2005 leak 25-35%, a code-compliant new install is under 6%.
Fix options ranked by ROI
1) Aeroseal aerosolized sealant (best for existing duct, ~$1,800-$3,500). 2) Hand-seal accessible joints with mastic (cheap, partial fix). 3) Full duct replacement (best done at system replacement).