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ENERGY STAR says the minimum attic insulation in the northern U.S. is about what?

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  1. R-49 (about 16 to 18 inches)
  2. R-19 (about 6 inches)
  3. R-11 (about 3 inches)

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References

  1. ENERGY STAR: Check your attic insulation www.energystar.gov/products/ask-the-experts/how-to-check-your-homes-attic-insulation-level Checked 2026-10-10.

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