Duct Sealing Costs

On February 25, 2026 By newsroom Topic: Home Services

1. Average Costs

Typical Range: $0.50–$1.50 per square foot
National Average: ~$1 per square foot
Full-Service Costs: $1,300–$2,250 (depends on sealing method and home size)

| Home Size (sq. ft.) | Cost Range | |--------------------------|------------------------| | 1,000 | $500–$1,500 | | 2,000 | $1,000–$3,000 | | 3,000 | $1,500–$4,500 |

2. Factors Affecting Cost

Sealing Method

Manual Sealing:
Covers large holes and gaps with metal tape or mastic.
Costs ~$2,250 on average.
Aerosol Sealing:
Ideal for small leaks and seams; uses spray sealants like Aeroseal.
Costs ~$1,300.

Accessibility

Easy Access (attics, crawlspaces): Lower costs.
Difficult Access (behind walls, under tile floors): Higher costs due to labor intensity.

Extent of Leaks

$50 per vent for simple sealing.
$50–$100+ per leak for hidden or hard-to-reach areas.

Additional Services

Inspection: $150 on average.
Pressure Testing: $200–$450 to confirm ductwork is sealed.

3. DIY vs. Hiring a Pro

| Option | Cost | Pros/Cons | |---------------------|-------------|--------------------------------------------------------| | DIY | ~$100 | Save labor costs but may miss leaks without proper tools. | | Professional | $1,300–$2,250 | Ensures thorough sealing, especially for hidden leaks. |

While DIY is cheaper, a professional job includes inspections, better sealing methods, and potential rebates.

4. Rebates & Incentives

Many states and utilities offer energy rebates for duct sealing.
Check DSIRE Database for available programs in your area.

5. Benefits of Duct Sealing

Energy Savings: Reduces heating and cooling costs by up to 20–30%.
Improved Comfort: Balanced temperatures across your home.
Enhanced Air Quality: Seals prevent dust and mold infiltration.
HVAC Longevity: Reduces strain on your system.

6. Tips to Save Money

Opt for Aerosol Sealing: Cheaper for minor leaks.
Bundle Services: Combine sealing with duct cleaning or insulation.
Plan for Rebates: Research incentives to lower out-of-pocket costs.
Schedule Inspections: Identify all leaks to ensure complete sealing.
Pressure Test Post-Sealing: Confirms effectiveness and prevents future costs.

Duct sealing is a worthwhile investment, offering both comfort and cost savings over time. For best results, hire a professional and take advantage of available rebates!