Insulation Types
| Type | R-Value/inch | Best For | DIY? |
|---|---|---|---|
| Fiberglass batts | R-3.2 | Walls, attic | Yes |
| Blown fiberglass | R-2.5 | Attic | No |
| Cellulose | R-3.5 | Attic, walls | No |
| Spray foam | R-6.5 | All areas | No |
| Rigid foam | R-5 | Basement, exterior | Yes |
2026 Rebates
Federal: Home-energy credit rules changed after December 31, 2025, so verify current IRS guidance before assuming a new residential tax credit.
State / Utility Programs: Insulation rebates still vary by utility, state-energy office, and income qualification.
Check current local program rules before budgeting net cost.