Direct answer
The rim joist (where foundation meets framing). 4-6 hours of work, $800-$1,500, often delivers 10-15% utility savings. Highest ROI of any home-energy project. Then attic. Then walls.
Authoritative sources
- US Department of Energy ↗
DOE Energy Saver guide to insulation types, R-values, and recommended applications.
- IRS Section 25C ↗
Energy Efficient Home Improvement Credit, up to $1,200/yr for qualifying insulation work.
- Energy Star ↗
Energy Star recommendations for attic and wall insulation R-values by climate zone.
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