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Attic Insulation Payback Calculator
Attic insulation upgrade from R-19 to R-49 can cut heating/cooling bills 15-25%. Cost: $1,500-$4,500 depending on sqft and R-value. IRA tax credit covers 30% up to $1,200. This calculator runs payback.
Payback years (after credit)
4.9
Annual savings
$396
Install cost
$2,800
Tax credit
$840
Net cost after credit
$1,960
25-year lifetime savings
$9,900
How the math works
1,400 sqft attic R-19 → R-49: 30-point increase → 18% HVAC savings = $396/yr. Install $2,800 − $840 tax credit = $1,960 net. Payback 4.9 years.
One of the best-payback home upgrades for most houses. Especially strong in cold climates (MN, WI, ME) where heating is expensive. Do it; the math almost always wins.
How to Use
- Enter sqft, current R-value, target R-value, and annual heating/cooling bill.
- See payback years and lifetime savings.
Frequently Asked Questions
What R-value target?
DOE recommends R-49 to R-60 in cold climates, R-30 to R-38 in warm. Typical existing: R-19 to R-30. Most homeowners benefit from adding R-19 to R-30 on top of existing insulation.
DIY or pro?
Blown-in cellulose or fiberglass is ~$1/sqft DIY plus rental blower. Pro: $1.50-$3/sqft but ensures proper coverage. Spray foam: pro only, $2-$4/sqft.
Tax credit?
25C Residential Energy Efficient credit: 30% of cost up to $1,200/yr for qualifying insulation. Requires Energy Star products and proof of purchase. File Form 5695.
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