Observed arrival · 2026-08-28

InsulationPayback: The Attic Math by County

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A free county-level calculator estimates attic-insulation costs, annual savings, and payback time across the United States.

Landing page captured for the 2026-08-28 issue.

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The calculator separates two materially different starting points: bare joists and an attic with roughly 3–4 inches already installed. Its examples show why that distinction matters, ranging from a 0.7-year payback in North Slope Borough for a bare attic to a 46.4-year payback for topping up in Río Grande Municipio. Estimates use a typical 1,000-square-foot attic, national-average installation costs, energy prices, DOE/IECC climate zones, and NOAA 1991–2020 degree-day normals.

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