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Weatherization · 7 min readDecision Tree
Insulate the attic first. R-49 attic insulation has a 1-5 year payback period in Massachusetts; window replacement has 15-20 year payback. Plus Mass Save covers 75-100% of attic insulation cost (homeowner pays $0-$1,200 net) vs windows that cost $580-$1,400 each net of Energy Star $50-$120 rebate. The math is decisive: attic first, windows later.
The math:
| Project | Cost (Net of Rebate) | Annual Savings | Payback |
|---|---|---|---|
| R-49 attic insulation + air sealing | $0-$1,400 | $340-$680 | 1-5 years |
| 30-window replacement (U-0.27) | $15,000-$24,000 | $300-$600 | 25-50 years |
Attic wins on every metric: cost, savings, payback. Plus the rebate covers most of attic cost; windows have lower percentage rebate.
Frequently Asked Questions
Should I do windows ever?
What if my attic insulation is already R-30?
References & Sources
Continue Reading
R-19 to R-49 upgrade payback math, the Mass Save 75-100% rebate path, and why most MA homeowners pay $0 out of pocket on this project.
12 heat loss sources ranked by impact + Mass Save rebated remediation cost — start with highest-impact, lowest-cost wins first.
What MA stretch code requires, the cost jump from U-0.30 to U-0.27 to U-0.22, and the Mass Save Energy Star window rebate path.
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