Last Updated: 2026-07-14
Attic insulation pays for itself in 1–2 years. Walls take 5–8 years. Floors are somewhere in between. But the real question isn't "how much does it cost" — it's "how much are you losing every year without it?"
| Location | Upgrade | Cost (1500 sqft home) | Annual Savings | Payback |
|---|---|---|---|---|
| Attic | R-19 to R-49 | $1,500–$3,000 | $200–$600 | 1–2 years |
| Walls | R-0 to R-13 | $3,000–$6,000 | $150–$300 | 5–8 years |
| Floors | R-0 to R-19 | $2,000–$4,000 | $100–$250 | 3–5 years |
| Basement | R-0 to R-10 | $1,500–$3,000 | $100–$200 | 4–6 years |
R-value measures resistance to heat flow. Higher = better insulation. Here's what each type delivers per inch:
| Material | R-Value Per Inch | Cost/sqft | Best For |
|---|---|---|---|
| Fiberglass batts | R-3.2 to R-3.8 | $0.50–$1.00 | Attics, walls |
| Blown cellulose | R-3.2 to R-3.8 | $0.80–$1.50 | Attics, hard-to-reach areas |
| Spray foam (closed cell) | R-6.0 to R-7.0 | $2.00–$4.00 | Rim joists, crawl spaces |
| Rigid foam board | R-4.0 to R-6.5 | $1.50–$3.00 | Basement walls, exterior |
| Mineral wool | R-3.0 to R-3.3 | $0.80–$1.50 | Fire resistance, soundproofing |
Don't insulate your walls before your attic. Here's the correct sequence for maximum ROI:
| Type | DIY Cost | Pro Cost | Recommendation |
|---|---|---|---|
| Attic batts | $800–$1,500 | $1,500–$3,000 | DIY if accessible |
| Blown-in attic | $400 (rent blower) | $1,000–$2,000 | DIY possible, pro faster |
| Wall insulation | Very difficult | $3,000–$6,000 | Pro only |
| Spray foam | Not recommended | $2,000–$5,000 | Always pro |
Most utilities offer $0.50–$2.00/sqft rebates for insulation upgrades. The Inflation Reduction Act provides federal tax credits of 30% up to $1,200/year. Combined, these can cut your cost by 40–60%. For a baseline before any project, see our 30-day test of the best home energy monitors.
Take the Quick Quiz to get a personalized insulation recommendation based on your home's age, climate, and current insulation levels.
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