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Economic Calcs
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Window Data
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Window Economic Comparison
(Edit cells highlighted YELLOW only. All other values are calculated)
Current Oil Price $/Gallon
Net Present Value
Yearly Oil Price Increase %
of total savings in
Years:
Material Cost Difference
Freight Cost Difference
Fixed Energy Price:
per gallon
Installation Labor Difference
delivered over the system's lifetime
Annual Maint. Cost Difference
Federal Tax Credit %
State + Local Incentives $
General Inflation %
Depreciation (CCA) Rate %
Sales Tax Rate (Fed+State) %
Corporate Income Tax Rate %
Total Cost Before Grants&Tax:
Total Cost After Sales Tax:
Total Cost After Tax & Grants:
Fuel Savings: Gallons/yr:
GHG Emission reduction Lbs/yr
Year #
ROI
Savings $/yr
Cumulative
Depreciation
Cash Flow
0
0.0%
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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25
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Economic Calcs
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Window Data
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Window Prices (From Capitol Glass)
Double Glazed, Low-E
Type
Qty
Price
Total
Notes:
A
1. Manually edit values in yellow highlighted cells only. All other values are calculated.
B
2. GHG emission reduction is calculated at 22.2 Lb/Gal, per EPA.
C
3. Payback period (breakeven) is the point at which the Cash Flow curve crosses
D
the zero line.
E
4. "Fixed Energy Price" is Total Cost divided by Gallons/Yr saved * No of years.
Total
5. Note that charts do not update when number of years is changed above.
They are fixed at 10 years.
Triple Glazed, Low-E
Type
Qty
Price
Total
A
B
C
D
E
Total
Cost Difference:
Specified U-Values
Double Fixed
Btu/Hr/degF
Triple Fixed
Btu/Hr/degF
Double Casement
Btu/Hr/degF
Triple Casement
Btu/Hr/degF
Akwarm Results
Double Pane
Gallons/Yr
Dble Pane
Gallons/Yr
Difference
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