What does duct sealing involve in Wilmington?
Duct sealing typically costs about $1,000 to $6,000, and Aeroseal about $1,500 to $6,900, depending on access and leakage. Energize Delaware lists duct sealing rebates of about $550 to $850 through Home Performance. Mastic works well on accessible joints; Aeroseal reaches hidden leaks up to about 5/8 inch from the inside.
What are the signs you need duct sealing?
- Ducts in a hot attic or vented crawlspace
- Rooms far from the equipment are weak
- Dusty home despite good filters
- High bills with no equipment problem
- Disconnected or crushed flex duct
- Musty basement air pulled into the system
How much does duct sealing cost?
| Item | Typical range |
|---|---|
| Duct sealing (total) | $1,000 – $6,000 |
| Aeroseal | $1,500 – $6,900 |
| Duct pressure testing | $200 – $450 |
| Energize Delaware duct sealing rebate | $550 – $850 |
Published U.S. ranges for planning only, not Wilmington quotes. Your written price depends on diagnosis, access, equipment, permits, and timing. Sources: HomeGuide – air duct sealing cost; Energize Delaware – Home Performance rebate pricing (Sep 2025).
What should a good service visit include?
- Pressure-test total duct leakage
- Repair disconnected or damaged runs first
- Seal with mastic, tape rated for ducts, or Aeroseal
- Retest and document the leakage reduction
What is different about Wilmington properties?
Postwar homes in Brandywine Hundred and split-levels in Pike Creek often have attic or crawlspace ductwork where leakage matters most. Rowhouse basements with panned joist returns are another common leak source.
Ask the responding provider for identity, applicable Delaware license information, a written diagnosis or scope, total price, and warranty terms.
Related guides
- Why Is the Upstairs So Hot in a Wilmington Home?
- HVAC Rebates and Incentives in Delaware (2026)
- Return-Air Problems in Older Two- and Three-Story Homes
- When Duct Sealing Helps and When Ducts Need Redesign
- How Weatherization Changes HVAC Sizing
Where do we take duct sealing requests?
Requests are accepted across Wilmington and nearby New Castle County communities, and duct sealing comes up most often in Brandywine Hundred, Pike Creek & Marshallton.
