Payback timeline
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Simple payback period
Example calculation
Retrofit economics
Evaluating retrofit economics...
Annual bill savings
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15% reduction in heating/AC
Net out-of-pocket cost
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After rebates and tax credit
10-Year net savings
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Total cash saved over 10 yrs
Before vs after attic retrofit
Annual heating and cooling bills and cumulative 10-year expenses:
| Expense Metric | Before Upgrade | After Air Sealing & Insulation |
|---|---|---|
| Annual Heating & Cooling Bill | -- | -- |
| Upfront Out-of-Pocket Cost | $0.00 (baseline) | -- |
| Total Incentives (Rebate + Tax Credit) | $0.00 | -- |
| Unit Project Cost | -- | -- |
| 10-Year Cumulative Heating & Cooling Cost | -- | -- |
Comfort and Non-Energy Benefits:
Beyond lowering monthly bills, sealing attic air leaks stops the stack effect that pulls cold winter drafts into your living space. Adding insulation keeps second-floor bedrooms cooler in the summer and stops warm indoor air from melting roof snow, which prevents destructive winter ice dams.
Sensitivity: energy expenditure vs bill reduction
Payback duration in years across different heating/cooling bills and efficiency gains:
| Current Bill | 10% Bill Reduction | 15% Bill Reduction | 20% Bill Reduction |
|---|
How this estimates
Section 25C Tax Credit: The federal Section 25C tax credit for insulation and air sealing expired after 2025-12-31. Utility weatherization rebates and state programs may still provide upfront incentives.
Disclaimer: A planning estimate based on your inputs and the assumptions shown. Actual costs and eligibility may differ. Actual savings depend on existing insulation levels, air leakage rates, HVAC efficiency, and weather extremes.