Formula
Break-even period = upfront investment ÷ (savings or contribution per period − additional cost per period).
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Estimated break-even period
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Reproducible, not guessed
Break-even period = upfront investment ÷ (savings or contribution per period − additional cost per period).
Energy Retrofit Payback Calculator does not automatically include the time value of money; use a stricter break-even requirement for long periods.
Results are for first-pass estimates and scenario comparison. Important tax, employment, health and investment decisions should be verified against local official guidance or a qualified professional.