Insulation Payback Calculator
Annual savings ≈ heat-loss reduction × heating-degree-days × $/kWh ÷ system efficiency. Payback = install ÷ annual.
- Annual energy saved
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- Annual $ saved
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- Payback period
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Uses Q = (Δ(1/R)) × A × HDD × 24 ÷ 3412 BTU/kWh. Excludes cooling savings, comfort improvements, and rebates / tax credits.
About this tool
Insulation Payback Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
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