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!
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