How Can I Seal a Leaking Air Duct to Improve HVAC Efficiency?

You can seal a leaking air duct by using in-system Aeroseal or an interior lining like Duct Armor to close leaks from the inside and improve HVAC efficiency. Most leaks form at joints or in rusted or in‑slab sections, so a proper inspection plus a pressure test guides the best fix; a pressure test tells you more than a flashlight peek. Aeroseal involves pressurizing the system, blocking vents, and injecting a polymer that seals leaks up to 5/8", with pre‑ and post‑leak diagnostics and a report. Duct Armor is a rubberized liner applied inside existing ducts to seal leaks, reinforce weak areas, and restore deteriorated or in‑slab ductwork without full replacement. Our technicians regularly apply these solutions for homes throughout the Leo area.

Choose based on what you see in testing:

• Aeroseal for measurable leakage across many seams and a need for documented results.
• Duct Armor for rusted, deteriorated, or in‑slab ducts that need reinforcement.
• Targeted duct restoration when only a few connections are loose or damaged.
• Include full-system cleaning when heavy debris is present so airflow and diagnostics are accurate.

Schedule an inspection and leak test before deciding to repair, restore, or replace any section. <br/> Updated: 2026-02-11 <br/> Need help in Leo, IN? Call (277) 267 0744 or book online.