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HVAC Recovery Step 2 of 4

Duct Sealing.
Stop Losing Your Heated Air.

Your HVAC works hard to heat and cool your air. Then leaky ducts dump part of it into your attic before it ever reaches your rooms: ENERGY STAR estimates a typical duct system loses 20 to 30 percent of the air it moves. Here's how to fix it.

Deploy the Duct Sealing Kit

How Duct Leaks Destroy Your Comfort

The Invisible Drain

Most duct leaks happen behind walls and in attics where you can't see them. Every leak means the system runs longer to deliver the same heat to your rooms.

The Pressure Problem

Leaky ducts create negative pressure that pulls in hot attic air, dust, and insulation fibers. Your rooms feel stuffy and your air quality drops.

The Comfort Gap

If one room is always too hot or cold, duct leaks are often the cause. Sealing balances airflow so every room gets its share.

The Quick Fix

Mastic sealant and foil tape on accessible ducts is a weekend DIY job. Professional testing with a duct blaster finds the hidden leaks.

Print the Full 4-Phase Audit Checklist

The Duct Sealing Kit

From DIY mastic and tape to professional duct sealing services — choose the right fix for your home.

DIY Seal

Budget

Mastic sealant + foil tape on accessible joints. A weekend DIY job.

Speedi-Products Duct Mastic Sealant

Water-based mastic for hand-sealing duct joints and seams. Brush-on, no gun needed.

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Duck Brand HVAC Duct Sealing Tape

UL-181 foil tape for seams and connections. Holds up to heat cycling, unlike regular duct tape.

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Pro Test & Seal

Performance

Duct blaster test finds all leaks. Professional sealing with Aeroseal or hand-sealing.

Full Replacement

Eco-Premium

New sealed ductwork with manual J load calculation. Best for older homes with major leaks.

Move to the next best fix

Use these next steps to confirm the bigger diagnosis, route into the right kit, or get a faster whole-home plan.

Quick Quiz

Get a fast diagnosis of your specific energy problem.

Get the Free Audit Checklist

Full 4-phase audit workflow for whole-home energy inspection.

Compare recovery kits

Curated kits matched to your specific leak pattern.

Browse all guides

Step-by-step fixes for thermostats, heat pumps, drafts and standby power.

Choose Your Next Step

Pick the fastest path based on how certain you are. Diagnose first, walk the DIY checklist, or go straight to a step-by-step fix guide.