Attic Insulation Cost in South Carolina:
R-Values, Air Sealing & Quotes
Average attic insulation cost in South Carolina: $900–$2,200. Recommended R-value: R-38 to R-49 (attic). Compare air sealing, ventilation, warranty, and rebate assumptions.
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$900–$2,200
Avg. Attic Project Cost
$220–$450/yr
Annual Energy Savings
R-38 to R-49 (attic)
Recommended R-Value
3–6 years
Typical Payback
Best Insulation Approach for South Carolina
Recommended: Attic air sealing + blown-in insulation to R-38
South Carolina's hot, humid summers make cooling savings the primary driver. Duke Energy Carolinas and Dominion Energy SC offer rebates. Crawl space encapsulation is particularly valuable in SC's humid climate.
| Project Type | Typical Cost | Operating Impact | Payback |
|---|---|---|---|
| Attic blown-in (R-49) | $1,000–$2,800 | $200–$450/yr | 3–6 yrs |
| Air sealing package | $400–$1,200 | $150–$350/yr | 1–4 yrs |
| Rim joist spray foam | $400–$900 | $100–$200/yr | 2–5 yrs |
| Wall insulation (existing) | $1,500–$4,000 | $150–$350/yr | 5–15 yrs |
| Crawl space encapsulation | $3,000–$7,000 | $200–$400/yr | 8–20 yrs |
South Carolina Insulation Rebates & Tax Credits
Current insulation rebate eligibility should be verified
Duke Energy Carolinas home energy programs
Dominion Energy SC rebates
Federal credit rules changed after 2025; verify current IRS rules
Programs change often. Ask each insulation contractor to confirm current rebate and tax credit rules before you sign.
Insulation Quotes by City in South Carolina
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