Utah 2025 Duct-Sealing Incentives: Rocky Mountain Power, ThermWise & Federal 25C (Simple Guide)

Good news: in Utah, homeowners can often stack utility rebates with the federal Energy Efficient Home Improvement Credit (25C) when tightening leaky ductwork. Below is a plain-English guide to what’s available in 2025, who qualifies, and how to file—plus when Aeroseal duct sealing makes sense alongside air duct cleaning.

1) Rocky Mountain Power (wattsmart) — Utah

RMP’s wattsmart Home offers cash rebates for duct sealing and for duct sealing + duct insulation in existing single-family homes:

• Duct sealing (standalone): $200 (electrically heated) or $100 (electrically cooled)
• Duct sealing + duct insulation: $400 (electrically heated) or $200 (electrically cooled)

Key requirements: must be an RMP residential customer in Utah; minimum 10 linear feet of exposed ducts in unconditioned space; sealing must cut leakage to outside by ≥50% with at least 100 CFM reduction; work must be completed by a program-qualified HVAC contractor; apply within 180 days of completion.

2) ThermWise® Weatherization (Enbridge Gas Utah)

For homes heated with natural gas, ThermWise provides a duct sealing & insulation rebate (single-family form) that pays $5.25 per linear ft. + $100, capped at $450. Pre- and post-testing is required, with a documented leakage reduction (≥50%). Installations must be completed by a ThermWise Authorized Contractor; submit within 6 months of installation. Links to the current application are in the “How to apply” section below.

3) Federal 25C tax credit (Energy Efficient Home Improvement Credit)

The federal credit covers 30% of qualified costs for insulation materials or systems and air sealing materials or systems, up to a $1,200 annual cap (shared with other building-envelope items). Materials/systems must meet the IECC standard in effect two years prior to installation (for 2025 installs, IECC 2023 baseline). Keep the Manufacturer’s Certification Statement for your records.

Important: for this category, labor costs are not eligible for the credit—only qualifying materials/systems. Labor is only creditable for certain equipment categories (e.g., heat pumps). Talk to your tax professional for personal guidance.

What stacks, and how to plan your project

1. Inspection & test first: We run a pre-seal duct test to quantify leakage (and clean first if the system is dusty: air duct cleaning).
2. Seal from the inside: Aeroseal duct sealing tightens the network without cutting drywall. Many homes see large leakage reductions.
3. Verify: We provide a printed before/after duct test you can attach to rebate/tax paperwork.
4. Claim utility rebates: File your RMP application within 180 days; ThermWise within 6 months of install (links below).
5. Claim 25C at tax time: Keep itemized invoices (materials vs. labor), the Manufacturer’s Certification Statement for the sealing materials, and the final paid receipt. Your preparer will use Form 5695.

Quick links & how to apply

• RMP wattsmart: Utah duct sealing & insulation rebates (apply online within 180 days)
• ThermWise (gas): Weatherization rebates — Single-family duct sealing/insulation application (PDF)
• Federal 25C overview: IRS Energy Efficient Home Improvement Credit (see IECC + annual caps)

FAQs

Can I combine cleaning and Aeroseal and still get rebates?
Yes. Cleaning is a best-practice prep step; it doesn’t impact eligibility. The rebate is tied to the duct sealing scope and documented leakage reduction.

Will 25C cover Aeroseal?
25C can cover the air-sealing materials/systems portion (if they meet IECC), but not labor. Your invoice should separate materials vs. labor. Always confirm with your tax professional.

What proof do I need?
Keep your pre/post duct test, itemized invoice, paid receipt, and (for 25C) the Manufacturer’s Certification Statement for the sealing material/system.