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Window Replacement Payback Calculator
Modern Energy Star double- or triple-pane windows save 12-25% on heating/cooling vs single-pane. Cost: $400-$1,200 per window installed. IRA tax credit: 30% up to $600/yr. This calculator runs payback.
Payback years (after credit)
34.7
Total cost
$9,750
Annual savings
$264
Net cost after credit
$9,150
How the math works
15 windows at $650 = $9,750. From old-double to Energy Star: 12% savings on $2,200 = $264/yr. After $600 tax credit, net $9,150. Payback 35 years — windows rarely pay back on energy alone.
Justify windows on comfort (no drafts), aesthetics, or home value. Energy ROI is usually secondary. If paying back is critical, prioritize insulation/HVAC first.
How to Use
- Enter number of windows and current type.
- Enter install cost per window and annual bill.
- See payback years.
Frequently Asked Questions
Payback is how long?
10-25 years typically. Windows are rarely the best energy ROI. Insulation, water heater, HVAC beat windows on payback. Choose windows for comfort and aesthetics more than pure ROI.
Triple-pane worth it?
Only in very cold climates (MN, ND, MT, AK) and even then, incremental ROI is marginal vs double-pane Energy Star. For most homes: double-pane with Low-E coating is the sweet spot.
DIY replacement?
Possible for like-for-like sized windows. Basic install: $150-$300 labor per window. DIY saves money but not forgiving — weatherproofing mistakes cost in bills and rot.
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