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Existing Homes in Chicago: Chicago, IL
View detailed description of Low-E Storm Windows
- Installing clear glass storm windows reduced the heating load by 13% with a 10-year simple payback term.
- Installing Low-E storm windows lead to a 21% reduction in heating costs and an average payback of less that five years.
- The average reduction in air leakage (at 50 Pascals of pressure) was 15 CFM (25.5 M3/hr) per window.
Storm Window Energy Savings Spring 2006
| |
% Energy Savings |
Reduced Therm Usage |
Annual Savings (at $1.39/Therm) |
Glass Area Square Feet (M2) |
Therms Saved per Square Foot (M2) |
| House 1* - Low-E |
27% |
432 |
$600 |
354 |
1.7 |
| House 2 - Low-E |
19% |
353 |
$490 |
151 |
3.2 |
| House 3 - Clear |
8% |
80 |
$111 |
137 |
0.9 |
| House 4 - Clear |
18% |
228 |
$317 |
238 |
1.0 |
| House 5 - Low-E |
23% |
245 |
$341 |
123 |
2.7 |
| House 6* - Low-E |
19% |
105 |
$145 |
248 |
0.6 |
| * Homes 1 and 6 did not have acceptable daily temperature-to-gas usage correlation coefficients requiring them to be removed from the final energy data analysis |
Installed Storm Window Cost 2006
| |
Total Window Cost |
Annual Energy Savings |
Simple Payback (yrs) |
| House 2 - Low-E |
$1,738 |
$490 |
3.5 |
| House 3 - Clear |
$1,344 |
$111 |
12.1 |
| House 4 - Clear |
$2,661 |
$317 |
8.4 |
| House 5 - Low-E |
$1,738 |
$341 |
5.1 |
Total cost required to purchase and install both the clear and the Low-E storm windows are included in the table below.
Installed Storm Window Cost 2006
| |
Window Cost |
Low-E Coating |
Installation |
Total Cost |
| House 1 - Low-E |
$3,206 |
$711 |
$1,485 |
$4,691 |
| House 2 - Low-E |
$1,198 |
$273 |
$540 |
$1,738 |
| House 3 - Clear |
$879 |
$0 |
$495 |
$1,344 |
| House 4 - Clear |
$1,671 |
$0 |
$990 |
$2,661 |
| House 5 - Low-E |
$1,197 |
$273 |
$540 |
$1,738 |
| House 6 - Low-E |
$1,809 |
$515 |
$1,080 |
$3,404 |
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