Attic insulation is one of the highest-ROI home improvements available. Inadequate attic insulation accounts for up to 25% of a home's heat loss. Upgrading typically pays back in energy savings within 3-5 years.
Cost by insulation type
Blown-in fiberglass or cellulose: $1,500-$3,000 for a 1,500 sq ft attic. This is the most common and cost-effective option. Spray foam insulation: $3,000-$6,000+ but provides superior air sealing. Batt/roll insulation (added over existing): $800-$1,500 as a DIY-accessible option.
R-value requirements by climate
The Department of Energy recommends R-38 to R-60 for attics in most US climates — that's 10-19 inches of blown-in insulation. Cold climates (Minnesota, Wisconsin, New England) need R-49 to R-60. Warm climates (Florida, Texas) still benefit from R-38 to reduce cooling load.
Removing old insulation
If your existing insulation is contaminated with mold, rodent droppings, or asbestos, it must be removed before adding new insulation. Removal costs $1-$2/sq ft, adding $1,500-$3,000 to most attic projects. Asbestos abatement requires specialized contractors.
Tax credits and rebates
The Inflation Reduction Act provides a 30% tax credit (up to $1,200/year) for insulation improvements. Many utility companies offer $0.10-$0.50/sq ft rebates for attic air sealing and insulation. Check your utility's website and energystar.gov for current programs.
Bottom line
Attic insulation at $1,500-$3,000 for a typical home delivers one of the best ROIs in home improvement. Factor in tax credits and the math gets even better.
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